The following infinitives require preposition to be suffixed o verb based infinitives.
accettare† (to accept)
ammettere† (to admit)
aspettare† (to wait)
avere bisogno† (to need)
avere paura† (to be afraid)
avere voglia† (to feel like)
cercare† (to try)
credere† (to believe)
domandare† (to ask)
finire† (to finish)
offrire† (to offer)
pensare† (to plan)
sapere† (to know)
suggerire† (to suggest)
tentare† (to try)
vietare† (to forbid)
Ho bisogno di un caffË.† (I need a coffee.)
Ho finito di mangiare alle otto.† (I finished eating at 8:00.)
Tentiamo di riparare l'aspirapolvere.† (We're trying to fix the vacuum cleaner.)
†
Where prepositions are concerned, it would be only required to say, that some verbs require the prepositions again be followed by infinitives, in which case the preposition or prepositions used may not always be translated to English.
E.g.
abituarsi† (to get used to)
aiutare† (to help)
andare† (to go)
cominciare† (to begin)
divertirsi† (to enjoy oneself)
fermarsi† (to stop)
imparare† (to learn)
invitare† (to invite)
mandare† (to send)
mettersi† (to begin)
obbligare† (to oblige)
pensare† (to think of)
riuscire† (to succeed)
sbrigarsi† (to hurry)
stare† (to stay, to stand)
tornare† (to return)
venire† (to come)