(新课标)2018高三英语一轮复习 语法部分 语法专项突破 第10讲 非谓语动词课件
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语法(非谓语动词)I. 动词不定式和动名词的构成形式动词不定式是由“ to + 动词原形”构成;动名词由动词+ing构成。
主动式有:一般式、进行式、完成式和完成进行式;II. 动词不定式、动名词用法要点讲解一.做主语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 doIt's our duty to take good care of the old.②It takes sb + some time + to doHow long did it take you to finish the work?③It+be+形容词+for sb+to doIt is difficult for us to finish writing the composition in a quarter of an hour.④It+be+形容词+of sb+to doIt is stupid of you to write down everything the teacher says.⑤It seems(appears)+形容词+to doIt 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。
语法(非谓语动词)I. 动词不定式和动名词的构成形式动词不定式是由“ to + 动词原形” 构成;动名词由动词+ing 构成。
.做主语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 doIt's our duty to take good care of the old.②It takes sb + some time + to doHow long did it take you to finish the work?③It +be+形容词+for sb +to doIt is difficult for us to finish writing the composition in a quarter of an hour.④It +be+形容词+of sb +to doIt is stupid of you to write down everything the teacher says.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's kind of you to help me with my English.=You are kind to help me with my English.⒉动名词做主语Learning without practice is no good. 动名词做主语时,也常用It 句式。