Modal verbs of Permission, Obligation and Prohibition

Complete the sentences with the correct modal verbs. In some cases, you need to use a subject pronoun. You can tell which pronoun you need to use by reading the rest of the sentence. For some of the sentences, more than one modal verb can be used. Choose one of them to answer the question correctly. Be careful with “must”, “have to” and “need to”.

Example: Everybody has to pay taxes if they earn money.

“Remember to use the right key when using the English apostrophe”