The bare infinitive is the base form of the verb used without the infinitive particle to. It may be used:
a) After the dummy operator do. Examples :
I do like those shoes
He didn't see her
b) Following a modal auxiliary. Examples :
We must go.
We can start now
c) After certain other verbs including, make, have, let, help and verbs of perception. Examples :
He made her go.
She had him mow the lawn
He helped her pack
She felt him touch her arm.
They heard the car start.
d) After the expressions had better / had rather. Examples :
You had better leave
I'd rather not go
