Understanding Modal Verbs in English: Context, Usage, and Practice Questions

Originally published March 2023. Last reviewed 3 July 2026.

Modal verbs are a unique and essential aspect of the English language. They help express various ideas such as probability, ability, obligation, permission, and habits. In this article, we will delve into the different modal verbs, and their usage, and provide practice questions to test your understanding.

Modal Verbs:

The list of modal verbs in English includes:

1. can
2. could
3. may
4. might
5. will
6. would
7. must
8. shall
9. should
10. ought to

These verbs differ from normal verbs in three ways:

1. They don’t use an ‘s’ for the third person singular.
2. They make questions by inversion (e.g., ‘she can go’ becomes ‘can she go?’).
3. They are followed directly by the infinitive of another verb (without ‘to’).

Context and Usage:

Modal verbs have various applications in English, such as expressing probability, ability, obligation, permission, and habits.

Probability:

Modal verbs can indicate the likelihood of an event occurring. 

Examples include:

It’s snowing, so it must be very cold outside.

I don’t know where John is. He could have missed the train.

This bill can’t be right. £200 for two cups of coffee!

Ability:

We use ‘can’ and ‘could’ to describe skills or abilities. 

Examples include:

She can speak six languages.

My grandfather could play golf very well.

I can’t drive.

Obligation and Advice:

Modal verbs like ‘must’ or ‘should’ can express necessity or give advice. 

Examples include:

Children must do their homework.

We have to wear a uniform at work.

You should stop smoking.

Permission:

We use ‘can’, ‘could’, and ‘may’ to ask for and grant permission or to express prohibition. Examples include:

Could I leave early today, please?

You may not use the car tonight.

Can we swim in the lake?

Habits:

‘Will’ and ‘would’ can describe habits or customary actions. 

Examples include:

When I lived in Italy, we would often eat in the restaurant next to my flat.

John will always be late!

Past Modals:

Past modals such as ‘could have + past participle’, ‘should have + past participle’, and ‘would have + past participle’ can be confusing. 

For example:

She could have studied harder.

We should have left earlier.

I would have called you if I had known.

Practice Questions:

1. You ________ speak louder; I can’t hear you.
2. He ________ be tired after such a long flight.
3. ________ you help me with this math problem?
4. She ________ be the new manager; she just started working here.
5. If I had more time, I ________ learn how to play the guitar.
6. You ________ not park here; it’s a no-parking zone.
7. They ________ have left early to avoid traffic.
8. ________ I have another piece of cake, please?
9. When I was a child, I ________ climb trees easily.
10. You ________ visit the doctor if you feel unwell.
11. We ________ meet at the cafe at 5 PM.
12. ________ you tell me the time, please?
13. She ________ have taken a different route to avoid the traffic jam.
14. If I knew her address, I ________ send her an invitation.
15. You ________ not touch the artwork in the museum.
16. ________ we go to the movies tonight?
17. She ________ play the violin when she was in high school.
18. You ________ submit your assignment by the deadline.
19. He ________ be at the gym right now.
20. ________ I have a glass of water, please?
21. When we were kids, we ________ ride our bikes to school every day.
22. You ________ take an umbrella with you; it looks like it might rain.
23. I ________ believe he’s getting married next month.
24. ________ you open the window, please?
25. If I had known about the sale, I ________ have bought a new pair of shoes.

Answers:

1. should
2. must
3. Can / Could
4. can’t
5. would
6. must
7. might / could
8. May / Can
9. could
10. should
11. will
12. Can / Could
13. must
14. would
15. must / may
16. Can / Shall
17. could
18. must
19. might / could
20. May / Can
21. would
22. should
23. can’t
24. Can / Could
25. would have

A Comprehensive Guide to Clauses in English Grammar

Originally published March 2023. Last reviewed 3 July 2026.

To effectively communicate in English, it’s essential to understand clauses and their various types. In this article, we will delve into the different types of clauses, offering unique examples and explanations to help you grasp their usage in English grammar.

What is a Clause?

A clause is a group of words that contains a subject and a predicate. Complete sentences are composed of at least one clause, although they may include multiple clauses. For instance:

• Lisa won the race. (One sentence, one clause)
• Lisa won the race, and she received a trophy. (One sentence, two clauses)

Types of Clauses

Four primary types of clauses exist in English grammar:

1. Independent Clauses (Main Clause)
2. Dependent Clauses (Subordinate Clause)
3. Relative Clauses (Adjective Clause)
4. Noun Clauses

1. Independent Clauses (Main Clause)

An independent clause is a complete sentence with a subject and verb, expressing a complete thought. The structure of an independent clause is as follows: Subject + Verb = Complete Thought. For example:

• Tom reads. (This sentence is complete, containing a subject and predicate.)

Independent clauses can be connected by coordinating conjunctions to form compound or complex sentences.

Coordinating Conjunctions:

• and
• but
• for
• nor
• or
• yet

2. Dependent Clauses (Subordinate Clause)

A dependent clause is part of a sentence that contains a subject and verb, but does not convey a complete meaning. While it may make sense on its own, a dependent clause requires the rest of the sentence for context and meaning. Dependent clauses are often connected to independent clauses to form complex sentences, typically starting with a subordinating conjunction.

Subordinating Conjunctions:

• after
• although
• as
• because
• before
• even if
• even though
• if
• once
• provided that
• rather than
• so that
• since
• though
• than
• that
• until
• unless
• whenever
• when
• whereas
• where
• whether
• while

Dependent Clause Structure:

Subordinate Conjunction + Subject + Verb = Incomplete Thought

Example:

• As soon as it starts raining, I’ll open my umbrella.

3. Relative Clauses (Adjective Clause)

Relative clauses begin with relative pronouns, such as who, which, or whose. These clauses help differentiate between human and non-human antecedents.

Relative Pronouns:

• Who(m): used when the antecedent is a person
• That: used for either a person or thing
• Which: used for anything except a person

Relative clauses can be restrictive (defining) or non-restrictive (non-defining). Restrictive clauses help identify the noun, while non-restrictive clauses provide additional information without specifying the noun.

Examples:

Restrictive: The author who wrote the mystery novel won an award.

Non-Restrictive: The author, who wrote the mystery novel, won an award.

4. Noun Clauses

Noun clauses are dependent clauses that function as nouns. They can act as subjects, direct or indirect objects, or predicate nominatives.

Examples:

• Can you tell me what

time the movie starts? (direct object)

• I will give whoever brings me coffee a big tip. (indirect object)
• Whatever you decide is fine with me. (subject)
• The winner is whoever finishes the race first. (predicate nominative)

Noun clauses often begin with pronouns or other words that have a grammatical function in the sentence.

• Relative pronouns: that, what, who, which, whom, whose
• Indefinite relative pronouns: whoever, whomever, whatever, whichever, whether, if
• Interrogative adjective: what
• Interrogative adverb: how
• Interrogative pronoun: who
• Subordinating conjunctions: whenever, how, when, if, where, whether, why

Common Mistakes

There are several common mistakes when using clauses in English grammar:

1. Comma splices: Connecting two independent clauses with just a comma, without using a coordinating conjunction or proper punctuation.
   • Incorrect: Sarah loves cats, she has three at home.
   • Correct: Sarah loves cats; she has three at home.
2. Run-on sentences: Writing two or more independent clauses without proper punctuation or conjunctions.
   • Incorrect: Lisa is a great cook her lasagna is delicious.
   • Correct: Lisa is a great cook, and her lasagna is delicious.
3. Misuse of relative pronouns: Using the wrong relative pronoun for the antecedent.
   • Incorrect: The car which was speeding got a ticket.
   • Correct: The car that was speeding got a ticket.
4. Dangling modifiers: Incorrectly placing a modifying clause or phrase, making the sentence unclear or illogical.
   • Incorrect: Walking down the street, the flowers smelled lovely.
   • Correct: Walking down the street, I smelled the lovely flowers.

Practice Questions

Select the best option for each question. The answers are provided at the end.

1. She won the lottery, _____ she bought a new house.
   1. So
   2. But
   3. and
2. _____ you finish your homework, you can watch TV.
   1. If
   2. Although
   3. Because
3. The dog _____ barks loudly belongs to my neighbor.
   1. that
   2. which
   3. who
4. _____ did you find the keys?
   1. Where
   2. When
   3. How
5. I can’t believe _____ they did for your birthday!
   1. what
   2. which
   3. that

[Answers: 1. a) so, 2. a) If, 3. a) that, 4. a) Where, 5. a) what]

Mastering Prepositions in English: A Comprehensive Guide

Originally published March 2023. Last reviewed 3 July 2026.

Prepositions are essential components of the English language, helping to create more meaningful and precise sentences. They can be quite challenging for learners to grasp, as their usage varies across different contexts. This article aims to provide a comprehensive understanding of prepositions, with explanations, examples, and practice questions to help you master their usage.

Prepositions of Time:

Prepositions are often used with time expressions to provide clarity about when an event occurred or will occur. Common prepositions of time include “on,” “in,” and “at.”

Examples:

We’ll meet on Friday.

I was born in 1995.

The party starts at 7 pm.

Practice Question: Fill in the blank with the appropriate preposition.

The concert is scheduled ________ 8 pm.

Prepositions of Place:

These prepositions are used to describe the location of an object or person. Common prepositions of place include “on,” “in,” and “at.”

Examples:

The book is on the shelf.

The cat is hiding in the box.

She is waiting at the bus stop.

Practice Question: Fill in the blank with the appropriate preposition.

The flowers are ________ the vase.

Prepositions after Adjectives:

Some adjectives are followed by specific prepositions to form a particular meaning.

Examples:

He is interested in history.

The cake is delicious with chocolate frosting.

She is proud of her achievements.

Practice Question: Fill in the blank with the appropriate preposition.

The students are excited ________ the upcoming field trip.

Prepositions after Verbs:

Certain verbs require specific prepositions to convey the intended meaning.

Examples:

They are talking about their plans.

I apologized for my mistake.

We should prepare for the exam.

Practice Question: Fill in the blank with the appropriate preposition.

He is looking ________ his lost keys.

Prepositions after Nouns:

Some nouns are followed by specific prepositions to create a more precise meaning.

Examples:

She has a passion for music.

They made a decision about the proposal.

There was a disagreement between the two parties.

Practice Question: Fill in the blank with the appropriate preposition.

The company made an investment ________ new technology.

Prepositions in Phrases:

Prepositions are also found in idiomatic expressions and fixed phrases.

Examples:

The train arrived in the nick of time.

He stood by her side through thick and thin.

She completed the task against all odds.

Practice Question: Fill in the blank with the appropriate preposition.

They resolved the issue ________ the end.

Understanding and mastering the use of prepositions in English is crucial for effective communication. By familiarizing yourself with their various uses and practicing with exercises, you will develop a strong foundation and improve your overall language skills.

Understanding Relative Clauses in English

Originally published March 2023. Last reviewed 3 July 2026.

A relative clause is a type of subordinate clause that provides additional information about a noun or pronoun in a sentence. This article will cover the basics of relative clauses, including defining and non-defining relative clauses, relative pronouns, and the various types of relative clauses you might encounter in English. It will also provide practice exercises and tips for improving your use of relative clauses in both written and spoken English.

Defining and Non-defining Relative Clauses

1. Defining relative clauses provide essential information to identify the noun or pronoun being described. Example: “I like the woman who lives next door.”
2. Non-defining relative clauses offer extra information that is not necessary for understanding the main point of the sentence. Example: “I live in London, which has some fantastic parks.”

Using Relative Pronouns in Defining and Non-defining Clauses

Subject Pronouns: “who” for people, “which” for things, and “that” for both people and things. Example: “The people who live on the island are very friendly.”

Object Pronouns: In defining relative clauses, the pronoun can be dropped. Example: “She loves the chocolate (which/that) I bought.” In non-defining relative clauses, use “who” for people and “which” for things, and the pronoun cannot be dropped. Example: “My boss, who is very nice, lives in Manchester.”

Prepositions in Relative Clauses

Prepositions can be placed at the end of the clause. Example: “The music (which/that) Julie listens to is good.”

Using ‘Whose,’ ‘Where,’ ‘When,’ and ‘Why’

“Whose” is used to replace possessive pronouns, “where,” “when,” and “why” can be used instead of relative pronouns and prepositions in some cases. Example: “I live in the city where I study.”

Relative Clauses with Prepositions and ‘Whom’

A preposition can be placed at the beginning of the clause for a more formal sentence structure. Example: “The city in which I study is very beautiful.” ‘Whom’ is the object form of ‘who’ and can be used in formal English when the relative pronoun refers to a person and functions as the object of the clause. Example: “The woman whom I admire greatly is a successful entrepreneur.”

Punctuating Non-defining Relative Clauses and Embedded Relative Clauses

Non-defining relative clauses are set off by commas. Example: “My friend, who is a professional dancer, just won a prestigious award.” A relative clause can also be embedded within another relative clause. Example: “The book, which I borrowed from the library, contains an article about the artist whose paintings we saw at the exhibition.”

Relative Clause Review and Practice Exercises

To solidify your understanding of relative clauses, try the following exercises:

1. Exercise: Relative Pronoun as the Subject
2. Exercise: Relative Pronoun as the Object
3. Exercise: Defining Relative Clauses (Subject and Object)
4. Exercise: Another Defining Relative Clauses Practice (Subject and Object)

Reduced Relative Clauses and Other Language Features

Reduced relative clauses can be created by omitting the relative pronoun and changing the verb form. Example: “The books (that are) written by Jane Austen are classics.” Other language features to consider when using relative clauses include appositives, relative clauses in other languages, and the use of relative adverbs, such as “where,” “when,” and “why.”

Improving Your Use of Relative Clauses

To further enhance your understanding and use of relative clauses, consider the following tips:

1. Read and analyze well-written texts: Reading books, articles, and essays can help you observe how relative clauses are used in various contexts and writing styles.
2. Practice writing your own sentences: Create sentences with different types of relative clauses, using a variety of relative pronouns and adverbs. This will help you become more comfortable with the different structures and patterns.
3. Review and edit your work: After writing, review your sentences to ensure that you have used relative clauses correctly and effectively. Look for errors in punctuation, parallelism, and pronoun reference.
4. Seek feedback from others: Share your writing with a friend, teacher, or language partner, and ask for feedback on your use of relative clauses. This can help you identify areas for improvement and gain insights into how your writing is perceived by others.
5. Practice speaking with relative clauses: Engage in conversations that require you to provide additional information about people, places, or things. This will help you become more comfortable using relative clauses in spoken English.

By incorporating these tips into your language learning journey, you will continue to strengthen your understanding and use of relative clauses in both written and spoken English. This will ultimately enhance your overall communication skills and enable you to express yourself more clearly and effectively. Remember to consider the various types of relative clauses, the role of relative pronouns, and the importance of punctuation and parallelism when constructing sentences with relative clauses.

Using Comparative Adjectives in English Grammar

Originally published March 2023. Last reviewed 3 July 2026.

Comparative adjectives are used to compare two things or people, highlighting their similarities or differences. In this guide, we will discuss the proper usage of comparative adjectives in English grammar.

Comparative structures for similarities

A. Using ‘as … as’ with a normal adjective

• John is as tall as Luke (= they are the same height).
• The red shirt is as expensive as the blue shirt (= they are the same price).

B. Using ‘not as … as’ to indicate dissimilarity

• Lucy is not as tall as Helena (= Helena is taller than Lucy).
• Paris is not as big as London (= London is bigger than Paris).

Comparative structures for differences

A. Using a comparative adjective with ‘than’

• France is bigger than Scotland.
• Luke is taller than Lucy.
• Your book is more interesting than my book.

B. Modifying comparisons with adverbs

1. Making the comparison stronger
   • Canada is far bigger than Scotland.
   • Your book is much more interesting than my book.
   • Amanda is a lot younger than Julie.
2. Making the comparison less strong
   • This exercise is a little more difficult than that exercise.

C. Using ‘less … than’ to show lesser degree

• Scotland is less big than France.
• Lucy is less tall than Luke.
• My book is less interesting than your book.

D. Showing change with ‘comparative and comparative’ or ‘more and more adjective’

• That child is getting taller and taller.
• The climate is getting hotter and hotter.
• This city is becoming more and more crowded.

Practice Questions

1. Write a sentence comparing the intelligence of two animals using ‘as … as’.
2. Write a sentence comparing the beauty of two places using ‘not as … as’.
3. Write a sentence comparing the weight of two objects using a comparative adjective with ‘than’.
4. Write a sentence comparing the spiciness of two dishes, making the comparison less strong.
5. Write a sentence showing change in the popularity of a TV show using ‘more and more adjective’.
6. Write a sentence comparing the busyness of two streets using ‘less … than’.
7. Write a sentence comparing the loudness of two sounds using a comparative adjective with ‘than’.
8. Write a sentence comparing the cleanliness of two rooms, making the comparison stronger.
9. Write a sentence showing change in the level of pollution in a city using ‘more and more adjective’.
10. Write a sentence comparing the heights of two buildings using ‘as … as’.

Answers:

1. The dolphin is as intelligent as the chimpanzee.
2. The desert is not as beautiful as the tropical rainforest.
3. The iron bar is heavier than the wooden plank.
4. The curry is a little spicier than the soup.
5. The TV show is becoming more and more popular.
6. The side street is less busy than the main road.
7. The thunder is louder than the rain.
8. The kitchen is much cleaner than the garage.
9. The city is becoming more and more polluted.
10. The Empire State Building is as tall as the Willis Tower.

Practice Questions:

1. The cat is _____ as the dog. ( fast)
2. The bicycle is _____ the motorcycle. (inexpensive)
3. The elephant is _____ the mouse. (heavy)
4. This coffee is _____ the other one. ( not bitter)
5. The traffic in the city is becoming _____ . (congested)
6. This road is _____ the highway. (less crowd)
7. Mount Everest is _____ Mount Kilimanjaro. (tall)
8. The countryside is _____ the city. (peaceful)
9. The days are becoming _____ as summer approaches. (long)
10. The two books are _____ in terms of their content. ( informative)

Answers:

1. as fast as
2. not as expensive as
3. heavier than
4. a bit less bitter than
5. more and more congested
6. less crowded than
7. taller than
8. much more peaceful than
9. longer and longer
10. as informative as