4. The use of the bare infinitive.

The bare infinitive is used:

1. After modal verbs (except “ought to”). F.e. You must do your homework today.
2. After the emphatic “do”. F.e. I do love you.
3. After the verb “to help”. F.e. Could you help me carry this bag?
4. After verbs of permission, causation:

1. make (in the active voice). F.e. They made me do it.

BUT in the passive “to” is used – F.e. I was made to do it.

1. have smb do sth. F.e. They had me come at 5. I won’t have you behave that way.
2. let (in the active only), in passive – “to be allowed to”.
3. bid. F.e. They bade me buy those shoos.  

1. In the inf. sentences, beginning with “why/why not”. F.e. Why not celebrate X-mas here?
2. After the verbs of perception (sensory verbs) – in the active voice only. [see, hear, watch, notice, feel, sense]. F.e. I saw him cross the street.
3. After the following expressions: had better, would rather, would sooner, would rather do sth than do sth, cannot but do sth, to do nothing but do sth, might just as well do sth.