Modals: general rules

What modal verbs can have "to" afterwards?

• Ought to, don´t have to, be able to

• Ought to, have to, be able to, need to

• Should to, have to, be able to, need to

• Ought to, have to, be able to, need to,

  could to

True or false? Modals can´t have a third person

• True

• False

• True, except be able to

• True, except be able to and have to

To make a question we...

• use question words

• place the modal at the beginning of the sentence

• use "do/did"

• we can´t make questions with modals

Is there a modal which cannot be used for questions?

• Yes, it´s be able to

• No, there isn´t

• Yes, might

• No, except may and ought to

Answer explanation

Might is consideres incorrect by some dictionaries, instead we use may.

Example: May I borrow your phone?

What do we write after a modal?

• an infinitive

• a gerund

• an infinitive with to

• a verb in present, past or future

• only verbs in future for possibilities

For the negative...

• we use don´t or doesn´t

• we don´t transform the modal to negative

• we transform the modal to negative

• we use don´t, doesn´t, didn´t or won´t