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动词不定式、动名词用法要点讲解_英语教学论文,动词不定式、动名

作者: 满分作文大全 发布时间: 2019年12月12日 03:22:57
动词不定式、动名词用法要点讲解_英语教学论文 由英语作文网收集整理 英语作文网
⒈不定式作主语
动词不定式作主语时,句子的谓语动词常用单数,其位置有以下两种:
(1)把不定式置于句首。如:
To get there by bike will take us half an hour.
(2)用it作形式主语,把真正的主语不定式置于句后,常用于下列句式中。如:
①It+be+名词+to do
It`s our duty to take good care of the old.
②It takes sb some time to do
How long did it take you to finish the work?
③It+be+形容词+for sb+to do
It is difficult for us to finish writing the compositionin a quarter of an hour.
④It+be+形容词+of sb+to do
It is stupid of you to write down everything the teachersays.
⑤It seems(appears)+形容词+to do
It seemed impossible to save money.
在句型③中,常用表示客观情况的形容词,如:difficult,easy,hard,important,impossible,necessary 等;在句型④中,常用careless,clever,good,foolish,honest,kind,lazy,nice,right,silly,stupid,wise等 表示赞扬或批评的词。在不定式前的sb,可看作其逻辑主语。这一句式有时相当于Sb is+形容词+to do句式 ,如:It`skind of you to help me with my English.=You are kind to helpme with my English.
⒉动名词作主语
Learning without practice is no good.
动名词作主语时,也常用It句式。如:
①It`s no good(no use,fun,a pleasure,a waste of time) doing…
It`s no good reading in dim light.
It`s no use sitting here waiting.
②It`s+形容词+doing
It`s dangerous swimming in the sea in windy days.
这样用的形容词有expensive,nice,tiring等,但important,necessary则不适用于这种结构,应用不定式 代替,如:It`simportant for you to keep fit.
③There is no doing
There is no saying what will happen next.
在这一结构中,动名词后常带宾语,相当于"It`s impossible to…"结构。
⒊动词不定式和动名词作主语的区别
①不定式作主语经常表示具体动作,常与特定的动作执行者联系在一起;而动名词作主语经常表示抽象动 作,经常不与特定的动作执行者联系在一起。如:
It`s no good eating too much fat.
It`s no good for you to eat so much fat.