bare infinitive, After the auxiliary verb do, does, did in negative sentences and questions., After modal verbs (will, can, must, should, might, may, etc.), to + infinitive, After adjectives (It's important ..., It's necessary ...)., To express a reason or purpose (why)., After question words (what, where, whom, etc.)., After some verbs (ask, decide, forget, help, hope, learn, need, offer, plan, promise, remember, etc. )., After verb+person (ask sb, recommend sb, etc.), gerund, When the verb is the subject of a sentence., After a preposition (of, on, in, under, about, before, etc.)., After some verbs (avoid, enjoy, keep, don’t mind, prefer, recommend, spend time, suggest, etc.)..

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