Some verbs need an infinitive in the complement and some ⇒ verbs need an-ing form instead.
What is the infinitive?
The infinitive in English grammar is the basic form of the verb.
The infinitive could be used in two ways:
1- By itself,
for example, play in I can play.
2- With (to),
for example, play in I learned to play tennis.
What are the verbs that need an infinitive in the complement?
agree – appear – arrange – ask
claim - consent
decide – demand – deserve
fail – forget
hesitate – hope
manage – mean
plan – prepare – pretend – promise
tend – threaten
wait – want