Question

分词,从句,不定式做主语的用法

Answer 1

分词不能作主语，只能作状语、宾补、表语等。从句不能作主语。动词不定式做主语一般表示具体的某次动作。当主语较长，谓语较短时，常用it做形式主语，而将不定式放到谓语的后面。It做形式主语，不定式放在谓语动词之后常用于下列结构中：It is+形容词(easy, important, difficult, foolish, inconvenient, unnecessary, right, wrong...)+( for/of sb.)+不定式。It is+名词(a pleasure, a pity, a pleasant thing, one’s du_ty, an honor, a shame, a crime, no easy job...)+不定式。
动词不定式作表语不定式作表语常表示将来的动作，主语常常是表示意向、打算、计划的词，如wish, idea, task, purpose, duty, job等
动词不定式作宾语不定式常在下列动词后面作宾语：afford, agree, apply, arrange, ask, attempt, beg, begin, care, choose, claim, consent, demand, decide, desire, determine, expect, fail, hope, hesitate, hate, intend, learn, like, manage, mean, neglect, offer, plan, prepare pretend, promise, refuse, resolve, seek, tend, threaten, want等。
不定式在句子中可做主语、宾语、表语、定语、状语和宾语补语