Marked infinitive (with to)
With certain verbs in the active voice, a noun or pronoun must come between the verb and the infinitive that follows it. The noun or pronoun usually names a person who is affected by the action.
advise |
convince |
order |
tell |
allow |
encourage |
persuade |
urge |
cause |
have (“own”) |
remind |
warn |
command |
instruct |
require |
Some verbs may be followed either by an infinitive alone or by a noun or pronoun plus an infinitive:
ask |
help |
promise |
would like |
expect |
need |
want |
Unmarked infinitive (without to)
An unmarked infinitive is an infinitive without to. A few verbs (often called causative verbs) may be followed by a noun or pronoun and an unmarked infinitive.
have (“cause”) |
help |
let (“allow”) |
make (“force”) |
NOTE: Help can be followed by a noun or pronoun and either an unmarked or a marked infinitive:
Exercises:
Verbs followed by gerunds or infinitives 1
Verbs followed by gerunds or infinitives 2