Modal Verbs - Rules

Modal verbs are auxiliary verbs that provide additional information about the main verb.

• True

• False

We add -s to the modal verb in the 3rd person singular.

• True

• False

Modal verbs are always followed by 'to' infinitive.

• True

• False

Questions are formed by placing the modal verb before the subject of the sentence.

• True

• False

Negatives are formed by placing an auxiliary verb form (don't, doesn't, didn't) before the modal verb.

• True

• False

Mark the modal verbs you use to express advice & suggestion.

• should

• had better

• don't have to

• ought to

Must and Have to are used to talk about obligation or strong necessity.

• True.

• False.

Use MUST NOT (mustn't) to express

• obligation.

• necessity.

• lack of obligation.

• prohibition.

To express absence of necessity or obligation, you may use

• mustn't

• don't have to / doesn't have to

• shouldn't

• needn't