不定式作主语

1、小胖说英语 之 不定式作主语,10月10日,英语句子结构,基本结构 主语+谓语+宾语 S + V + O 简称 “SVO” 不定式 （to do）,例子,To be, or not to be-that is a question 生存还是毁灭 To see is to believe. 眼见为实,教你很难。 To teach you is difficult. 那样做不是我的目的 To do like that is not my purpose. 同你讲话（我感到）很愉快。 To speak with you was very enjoyable.,你很难教. It is difficul

2、t to teach you. 我的目的不是去那样做。 It is not my purpose to do like that. 很高兴能同你讲话。 It was very enjoyable to speak with you.,为什么要把不定式放在后面，另外加形式主语it放句首？,老师说：1.避免头重脚轻 2. “美观” 小胖说：1.与中文比较，两者有相似性 你想强调什么就决定了不定式的位置 区别在于： 2.英语语言的逻辑性决定 线型 3. 习惯表达,早饭是我吃的。 The breakfast was eaten by me. 我吃了早饭。 I have the breakfast. 吃

3、了早饭的是我。 It is I who takes the breakfast. 吃绿色食品是健康的 To eat green food is healthy. 要健康就吃绿色食品。 It is healthy to eat green food.,不定式作主语是神马情况的？,(1)不定式置于句首。如： To get there by bike will take us half an hour.,你很难教. It is difficult to teach you. 我的目的不是去那样做。 It is not my purpose to do like that. 很高兴能同你讲话。 It

4、was very enjoyable to speak with you.,(2)用it作形式主语，把真正的主语不定式放后面，有以下句式。如： Its our duty to take good care of the old. SVO 被强调部分是名词 Itbe名词to do It takes me three hours to fix the pipe. SVO（主动表被动） 花钱，花时间 It takes sb + some time + to do 注：spend 只能是人做主语。 It seems(appears)形容词to do SVP It seemed impossible t

5、o save money.,保卫祖国是我们的义务。 好好学习是我们的目标。 赚很多钱是我们的理想。 我花了三天时间（才）通关（clear all the missions）。 我花了4000元买了一部iphone。,It is difficult for us to finish writing the composition in a quarter of an hour. It is very easy for me to drive a car. It is impossible to figure out that problem. 对某人来说是简单，容易，困难，必须，不可能的等。 强

6、调部分是形容词表示客观的情况。 1.Itbe形容词for sbto do,被强调部分是形容词 SVP,被强调部分是形容词,It is stupid of you to write down everything the teacher says. It is good of you to eat sushi at noon. 你好，你傻，你诚实，你聪明，你粗心，你懒。 强调部分是形容词表示主观的赞扬或批评。 2. Itbe形容词of sbto do,总结 it is+adj+for it is+adj+of的区别,在句型中，常用表示客观情况的形容词，如：difficult,easy,hard,

7、important,impossible, necessary 等； 在句型中，常用表示赞扬或批评的词。careless,clever,good,foolish,honest,kind,lazy,nice,right,silly,stupid,wise等 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：Its kind of you to help me with my English.=You are kind to helpme with my English.,(3)练习 我做这事太容易了。（这事对我来说太容易了） Its easy (for

8、me) to do that. 听到你的声音真高兴。 Its so nice to hear your voice. 当你不用车的时候，锁车是有必要的。 Its necessary for you to lock the car when you do not use it.,他帮助我们，他真好。 Its very kind/nice/good of him to help us. 我们真愚蠢，竟然相信了他。 It was silly of us to believe him. 他不给他们任何东西，这显得太自私(selfish)了。 It seemed selfish of him not to give them anything.,注意： 1) 其他系动词如，look，appear等也可用于