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Using Relative Pronouns and Modals

Students learn to combine two related sentences into one smooth sentence using relative pronouns such as who, which, that, and whose, and to choose modal verbs that show possibility, ability, or obligation with more precision.

Introduction

You already know that words like "who," "which," and "that" can connect ideas in a sentence, and that words like "can" and "should" add meaning to a verb. Now you will use these tools with more control. You will join two short sentences into one smooth sentence, and you will pick the exact modal verb that shows possibility, ability, or obligation.

Combining Sentences with Relative Pronouns

Sometimes you have two short sentences that talk about the same noun. You can join them into one sentence with a relative pronoun. Look at these two sentences:

"I read a book. The book was about sharks."

You can combine them: "I read a book that was about sharks." The word "that" takes the place of "the book" in the second sentence and joins the two ideas together.

Try another pair: "My friend plays soccer. My friend lives next door." Combined: "My friend, who lives next door, plays soccer." Using "who" lets you add extra information about your friend without repeating the word "friend" twice.

Choosing the Right Relative Pronoun

Each relative pronoun has a job. Use "who" for people, "which" for things or animals, "that" for people or things, and "whose" to show that something belongs to someone.

For example: "The girl whose backpack is red sits by the window." The word "whose" shows that the backpack belongs to the girl. Picking the correct pronoun makes your combined sentence clear and easy to read.

Modal Verbs for Possibility, Ability, and Obligation

Modal verbs come before the main verb and change its meaning. Different modal verbs show different ideas, so picking the right one matters.

Use "can" or "could" to show ability, what someone is able to do. Use "may" or "might" to show possibility, something that could happen but is not certain. Use "should" or "must" to show obligation, something a person needs to do.

Modal verbs sorted by the meaning they show, with an example sentence for each.

Putting Relative Pronouns and Modals Together

You can use a relative pronoun and a modal verb in the same sentence to write a clear, detailed idea. Look at this example: "The student who finishes early can help clean the classroom." The word "who" connects information about the student, and "can" shows the student's ability.

Here is another example: "Anyone who forgets their homework must talk to the teacher." The word "who" joins the two ideas, and "must" shows the obligation. When you build sentences like these, your writing sounds more organized and exact. For more focused practice choosing between these forms, see Relative Pronouns and Modal Verb Usage.

Key Terms & Definitions

Relative Pronoun: A word such as "who," "which," "that," or "whose" that joins two sentences about the same noun into one sentence.

Modal Verb: A helper word such as "can," "may," or "must" that comes before the main verb to show ability, possibility, or obligation.

Ability: What someone is able to do, often shown with "can" or "could."

Possibility: Something that could happen but is not certain, often shown with "may" or "might."

Obligation: Something a person needs or is required to do, often shown with "should" or "must."

Practice Activities

Find two short sentences in a story that talk about the same noun, and try joining them with "who," "which," or "that." Then write three sentences of your own, one showing ability, one showing possibility, and one showing obligation, using a different modal verb in each.

Related lessons

Relative Pronouns and Modal Verbs