(a) With complementary inf. in a verb phrase: to (do sth.); (b) with inf. modifying a verb, an inf. phrase, or a sentence and expressing purpose: in order to (do sth.), for the purpose of (doing sth.); (c) with inf. modifying an adj.: to (do sth.); (d) with inf. used adjectivally: to (have), for (having); (e) with inf. used as postposed subj. of a verb, with anticipatory hit: to (do sth.); (f) with inf. used as direct obj. of a trans. verb: to (do sth.); also, with inf. preceded by noun as subj. of the inf., the entire construction functioning as the direct obj. of a verb: to (do sth.) [1st quot.].