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语法 不定式,动名词

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语法 不定式,动名词

动词不定式是由“不定式符号 to+动词原形”构成的一种非谓语动词结构。有些动词不定 式不带 to,动词不定式可以作句子的主语、表语、宾语、定语、补语、状语或单独使用。 不定式保留动词的某些特性,可以有自己的宾语、状语等。动词不定式和它后面的宾语、 状语等一起构成短语,叫作不定式短语。现对九年级动词不定式的用法作一次简要梳理。一、用作主语直接把动词不定式置于句首的情况不多,多数情况用 it 作形式主语,把真正的主语 动词不定式置于句末,特别是不定式短语较长时。动词不定式作主语,谓语动词用第三 人称单数形式。带疑问词的不定式短语作主语常置于句首,复合不定式结构作主语常置于 句末。如:1.As young adults, it is our duty to try our best to deal with each challenge. (p.8)2.The head teacher said it was necessary to talk with his mother. (p.16)3.How to make requests politely is important.(p.93)二、用作表语动词不定式作表语,常说明主语的内容、性质、特征。如:1.The best way to improve your English is to join an English club. (p.7)2.The first thing is to greet the teacher. (p.96)三、用作宾语1.可以接带 to 的动词不定式作宾语的动词主要有:要求选择同意(ask, choose, agree), 期望决定学习(expect, hope, decide, learn),宁可假装知道(prefer, pretend, know),希望想要 愿意(wish, want, would like / love)。如:1)We decided to talk to some students about why they go there. (p.88)2)He prefers to eat white bread and rice.(p.50)3)Id love to visit Mexico.(p.53)2.动词 decide, know, learn, show, teach, tell.,介词结构 on.可用疑问词带 to 的不定式 短语作宾语,但 why 后面的不定式不带 to。如:1)Could you please tell me where to park my car?(p.92)2)It gives advice on what to do in lots of different situations. (p.32)3.动词 feel, find, make, think 等后面,可以用 it 作形式宾语代替真正的宾语动词不 定式,句子结构是.feel / find / make / . it+adj. / n.+to do.。如:I find it difficult to remember everything. (p.98)4.既可接动词不定式又可接 ving 形式作宾语,意思差别不太大的动词有 begin, start, like, love 等。一般说来,动词不定式表一次、数次的具体动作、将来动作或动作的全过程, ving 形式表习惯性的连续动作。但是这种区别并不很严格,特别是美国英语,即使是习惯 性的动作也可以用动词不定式。如:1)Then I started to watch English-language TV.(p.6)2)Im beginning to understand my Chinese roots, and who I am. (p.116)begin 用了进行时态,后面只接不定式作宾语,表示事情刚开始,还要继续下去。3)I like to eat vegetables. (p.118)感知动词 like, love, know 等一般不用进行时态。5.后接动词不定式或 ving 形式作宾语,意思差别较大的动词有 forget, remember 等。后 接不定式作宾语,表动作尚未发生;后接 ving 形式作宾语,表动作已经发生。stop to do 停 下来做另外一件事,to do 是目的状语;stop doing 停止做、不做当前这件事,doing 是宾语。 try to do 尽力做,try doing 试试看;go on to do 接着做另外的事,go on doing 继续做原来的 事。如:1)When I left home, I had forgotten to bring it with me.(p.107)2)I stopped using them last year. (p.121) 四、用作定语1.句子的主语或宾语是动词不定式的逻辑主语,不定式与其所修饰的名词、代词等存 在逻辑的动宾关系时,用动词不定式的主动式。如:1)I have so many chores to do today.(p.112)2)I cant think of any good advice to give her. (p.31)3)Basketball has also become a more popular sport for people to watch.(p.75)2.动词不定式所修饰的名词是 place, time, way 等时,不定式与这些名词呈现出动状关 系或同位关系。如:1)He needs time to do homework.(p.19)2)Is that a good place to hang out?(p.88)3)You want to know the best way to get around the city.(p.127)3.在“there be.”句型里,句子的主语是动词不定式动作的对象,常用主动式。如:1)Theres just so much to see and do here.(p.49)2). but there are still many things to do there.(p.54)五、用作补语动词不定式作补语时,在主动语态句里补宾语,在被动语态句里补主语,句子的宾语 或主语是不定式动作的逻辑执行者。如果不定式是 to be done,句子的宾语或主语就是逻辑 承受者。1.在主、被动语态句里用带 to 的动词不定式作补语的动词主要有:要求允许提议(ask, allow, permit, advise),期望邀请鼓励(expect, suppose, invite, encourage),教导告诉想要(teach, tell, want),等待希望愿意(wait for, wish, would like / love)。如:1)Id invite her to have dinner at my house.(p.29)2)Teenagers should be allowed to choose their own clothes. (p.18)3)Email English is supposed to be used on mobile phones.(p.101)2.动词不定式作补语,在主动语态句里不带 to,被动语态句里带 to 时多数动词是感官 动词和使役动词,包括四“看”:look at, observe, see, watch,三“让”:have, let, make, 二“听”:hear, listen to,一“感觉”:feel,一“注意”:notice。如:1)This picture makes me feel tense!(p.106)2)Of course we want to see Liu Yu achieve his dreams.(p.24)3.help 后接动词不定式作补语,to 可带可不带。一般说来,带 to 表间接帮助,不带 to 表直接帮助。在被动语态句里,或者用不定式的否定式作补语时要带 to。如:1). they can help you to compare two different products so that you can buy the one you really need.(p.106)2)Using email English helps you write quickly. (p.100)4.be said, be sure, happen, seem 等后面可以接带 to 的动词不定式作主语的补语。如:1)He doesnt seem to have many friends.(p.19)2)Be sure not to miss them if they come to a city near you.(p.114) 六、用作状语1.目的状语,置于句首或句末,置于句首时常表示强调。如:1)In order not to offend people, learning about language etiquette is just as important as learning grammar or vocabulary.(p.93)2)A group of young people got together to(in order to / so as to) discuss this question. (p.50)to do / in order to do / so as to do 用作目的状语,置句末时都可以用,置句首时只用 to do / in order to do。so as to do 一般不置于句首,可以引导结果状语从句,in order to do 不引 导结果状语从句。2.原因状语,多见于“sb.+be+adj.+to do.”结构句中。如:1)My dogs name is “Lucky”a good name for him because I feel very lucky to have him.(p.66)2)On Monday he told a radio interviewer that he had run out of money to buy old bikes. (p.64)3.结果状语,多见于“too.to” , “enough to.”结构句中。如:1)Then Im too tired to do well. What should I do?(p.28)2)The room needs to be big enough for three people to live in.(p.56)4.有些动词不定式作状语,常说明前面形容词的性质和特性。动词不定式与句子的主 语有逻辑的动宾关系。动词不定式前面的形容词一般是:cheap, dangerous, difficult, easy, fun, hard, interesting, necessary。不定式常用主动式表被动意义。. the mistakes you made are necessary for you to learn and understand.(p.116)这类句子中的动词不定式可改为主语。5.独立动词不定式多用作插入语,表示说话人的心理状态或对事情的看法。如:1)Id like to stay healthy, but to be honest, I only eat food that tastes good.(p.50)2)To begin with, she spoke too quickly, an

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