A. Use a to-infinitive after the following verbs: agree, decide, expect, happen, pretend, promise, manage, tend (for example, decide to do)

B. Use a to-infinitive after the following verbs plus their object: advise, allow, expect, forbid, want, force, tell (for example, allow him to do)

C. Use an infinitive without "to" after the following verbs plus their object: have, let, make, feel, see, hear, smell, find (for example, let Tom do it)