Ⅰ.动名词和 不定式 做主语的相同点 1. 不定式 短语和动名词做主语时，常常为了保持句子的平衡，用it来做形式主语，如： It is not easy to learn English well. It is no use asking him for help. 2.如果主语用了 不定式 ,表语和宾语也要用 不定式 ;主语用了动名词,表语和宾语也要用动名词,这在英语中称为对称性,如: To see is to believe. = Seeing is believing. (眼见为实) (85)It is better to stay home than _A__ out. A. to go B. going C. go D. gone Ⅱ.动名词和 不定式 做主语的不同点 1. 不定式 做主语常表示具体的某一动作;表示泛指 或 一般的抽象的概念时,多用动名词,如: (92)_B_ is a good form of exercise for both young and old. A. The walk B. Walking C. To walk D. Walk 2.在”There/It +be+ no use(good/help/need)”之后常用动名词做主语,而少用 不定式 ,如: It /There is no use crying over the split milk. It /There is no help taking this medicine. ★但是如果该句型中用了for引出 不定式 的逻辑主语,就只能用 不定式 ,如: (93) There is no good for us to do that exercise. 3. 不定式 可以和when, where, how, what, whether等连用,在句子中做主语,宾语和表语,而动名词则不能,如: How to solve the problem is a hot potato. Where to put the box seems hard to decide. Whether to do it hasn’t been decided. What to do next is up to you.
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