Ответ:

After the verbs: enjoy, like, prefer, imagine, suggest; after expressions such us: be busy used -ing form.

After certain verbs that hope, plan, refuse; after would love, sad, too, for used the to-infinitive.

After modal verbs(mustn't, can't stand, may); after the verbs make, waste; after would rather (I'd rather), hear used the infinitive without to.