Yee from Hong Kong writes: I'm so confused by the following verbs: hear, see, make, let and allow. Are these verbs followed by another verb in +ing form or to + base form? see / hear + object + verb ...

An "infinitive" in English is a verb preceded by the word to, as in to study. Many English verbs can be followed by a grammatical structure that contains an infinitive and is known as an "infinitive ...