We use the to-infinitive: • to express purpose (to answer
"Why...?"): He bought some flowers to give to his wife. He
locked the door to keep everyone out. We sometimes say in order
to or in order not to: We set off early in order to avoid the
traffic. They spoke quietly in order not to wake the children …
or we can say so as to or so as not to: We set off early so as
to avoid the traffic. They spoke quietly so as not to wake the
children. • after certain verbs (see verbs followed by
infinitive), particularly verbs of thinking and feeling: choose,
decide, expect, forget, hate, hope, intend, learn, like, love,
mean, plan, prefer, remember, want, would like, would love … and
verbs of saying: agree, promise, refuse They decided to start a
business together. Remember to turn the lights out. Some verbs
are followed by a direct object and the infinitive(see verbs
followed by infinitive): advise, ask, encourage, invite, order,
persuade, remind, tell, warn, expect, intend, would prefer,
want, would like She reminded m