Page 131 - Basic English Usage

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In a more formal style, we often use in order to or so as to.
He got up early in order to have time to pack.
| moved to 4 new flat so as to be near my work.
in negative sentences, we nearly always use the structure with so as not
toor in order not to.
I'm going to leave now, so as not to be late.
(NOT +m-geing to teavenow_nette-be-tate-)

179 infinitive without to

We usually put to before the infinitive (for example / want to go; It's nice
to see you). But we use the infinitive without fo in the following cases:

Modal auxiliary verbs
After the modal auxiliary verbs will, shall, would, should, can, could,
may, might and must, and after had better, we use the infinitive
without fo.
| must go now.
Will you help me?
It might rain.
You had better stop.

let, make, hear etc

After some verbs, we use an object and the infinitive without to. The
most common of these verbs are /et, make, see, hear, feel, watch, and
notice.

verb + object + infinitive without fo

She lets her children do what they want to.
| made them give me the money back.
| didn't see you come in.
| heard her say that she was tired.
In an informal style, we often use help with this structure.
Could you help me push the car?

why (not)
We can use an infinitive without fo after why. This usually means that it
is unnecessary or stupid to do something.
Why pay more at other shops? Our prices are the lowest.
Why not .. . 7is used to make suggestions.
Why not ask Susan to help you?