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The infinitive has several
forms.
to do:
• They hope to
visit you.
to be doing (for a
continuous action):
• It's nice to
be leading such an exciting life.
to have done (for a
completed or past action):
• We were sorry
to have missed you.
to have been doing (to stress
the frequency or length of the action):
• He appears to
have been making phone calls from the office every day.
The infinitive is used with to
after certain verbs, including ought, have, used, and be able.
See Section 4 of the Appendix. Notice the position of not before
to:
• Try not to
worry.
• He's
determined not to give in.
The infinitive is used without
to after most modal verbs,would rather, had better, let, *make,
*see, *hear, *feel, watch, notice, *help (informally). *lf these verbs
are used in the passive, the infinitive with to is used. Compare:
• I saw her
take the money.
• The champion was seen to
shake hands with his opponent.
Notice the very common It
is + adjective + to + infinitive:
• It is
difficult to understand what you mean.
• It was nice
to see you.
Also notice the construction object
+ to + infinitive after certain verbs:
• I want you to
enjoy yourselves.
• She begged
him not to go.
The idea of purpose is usually
expressed by to + infinitive, in order to + infinitive
or so as to + infinitive:
• He tiptoed
upstairs so as not to wake the children.
Notice:
• I have work to do.
• Nobody is to blame.
• The house is to le
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