to-infinitive: purpose, agree, appear, decide, expect,hope,promise, refuse, would like, after adjectives that express feelings, too/enough, it+be+adjective/noun, be+the first/second/last, ask, learn, explain, decide, want+question word(except "why"), to tell you the truth, to be honest, to sum up, to begin with, Help, feel, hear, listen to, notice, see (the whole), infinitive without to: modal verbs, let, make, see, hear, feel, had better/would rather, help, -ing forms : as a noun, love, enjoy, prefer, dislike, hate, be busy, it's no use, what's the use of, can't help, there's no point in, can't stand, have difficulty, spend, waste, lose, look forward to, be used to, object to, prefer .. to .., after prepositions, feel, hear, listen to, notice, see (partially),

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