通常用it 做形式主语,将不定式和动名词置于谓语后面,特别是主语较长时,或在一些习惯用法中.
1) 谓语是系表结构(be + 形容词 / 名词)时,常将不定式后置,构成句型 “it + be + 表语(形容词 / 名词)+ 不定式”.
例 1 It is my duty to care for that patient.
照料那位病人是我的职责.(做主语的不定式to care for that patient 后置,it 为形式主语)
例 2 It is not an easy thing to master a foreign language.
掌握一门外语不是件容易的事.
例 3 It isn’t right to speak ill of someone behind his back.
在别人背后说坏话是不对的.
2) 当谓语是 take,make,pay,cost ,require,feel,need 等动词时,或者是与情绪有关的动词 delight,amuse,excite,annoy,irritate 等时,习惯上常用 it 做形式主语,并将不定式后置.
例 1 It takes only ten minutes to get there.
到那儿只需十分钟.
例 2 It pays to be honest.
诚实是不会吃亏的.
例 3 It feels good to stay away from the crowded city.
能远离拥挤的城市,感觉真不错.
例 4 It annoyed her to see someone spit on the ground.
看见有人随地吐痰让她很生气.
3) 同不定式一样,动名词也可用于“it + be + 表语 + 动名词”句型中,二者的区别可参见10.2.2 中1)的论述.下面两组句子没有多大差异.
例 1 A) It is a waste of time to argue with him
B) It is a waste of time arguing with him.
和他争辩是浪费时间.
例 2 A) It is worthwhile to discuss this again.
B) It is worthwhile discussing this again.
这一点值得在讨论一下.
4) 但表语是(of)no use,not any use,not the slightest use,no good,not much good,fun等时,常用动名词(不用不定式)做主语并后置,用 it 做形式主语.
例如 It’s no use crying over spilt milk.
覆水难收.
5) 动名词还可在 there be 句型中做主语(不能用不定式),常见形式为 “there is no + 动名词”或 “there is no / any + 名词 + 动名词”.
例 1 There is no denying the fact.
事实无可否定.
例 2 There isn’t any use trying again.
再试也没用.
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