Bare infinitive

Infinitive without to

The bare infinitive is used

After the verbs do, does, and did e.g. He does not have her mobile phone. After verbs of perception (see, watch, notice, hear, listen to, feel,smell,etc) After let and make e.g. Let him come in now. After had better, would rather, cannot but, and c

an do nothing but e.g.. You had better go home.

May /Might

To say that it is possible for something to be true now or in the future

e.g. Jane is not here, she may/might be in the library.

Jane has not come, but she may/might be here tomorrow

For the past

May/Might + have +past participle e.g. This is Jane’s umbrella. She

may/might have been here this morning.

When someone did a wrong thing in the past Should/ought to + have +past participle e.g. You have broken the vase. You

should/ought to have been more careful.

When we feel sure something is true or not possible e.g. I hear snoring. Tom must be sleeping. For the past You looked tired. You can’t have gone to b

ed last night.