初三上册英语知识点归纳 to+动词原形 （1）作主语 动词不定式作主语时，（句子）的谓语动词常用单数，其位置有如下两种： (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，常用于如下句式中。 如： It+be+名词+to do Its our duty to take good care of the old. It takes sb+some time+to do How long did it take you to finish the work? It+be+形容词+for sb+to do It is difficult for us to finish writing the composition in a quarter of an hour. It+be+形容词+of sb+to do It is stupid of you to write down everything (that) the teacher says. It seems(appears)+形容词+to do It seemed impossible to save money. 在 句 型 中 ， 常 用 表 达 客 观 状 况 的 形 容 词 ， 如 ：difficult，easy，hard，important，impossible，necessary 等； 在句型中，常用careless，clever，good，foolish，honest，kind，lazy，nice，right，silly，stupid，wise 等 表达赞扬或批判的词。 在不定式前的 sb，可看作其规律主语。这一句式有时相称于 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）举例 （1） Its easy (for me) to do that.我做这事太简单了 easy, difficult, hard, important, possible, impossible, comfortable, necessary, better; the first, the next, the last, the best, too much, too little, not enough 1、Its so nice to hear your voice. 听到你的声音真快乐。 2、Its necessary for you to lock the car when you do not use it. 当你不用车的时候，锁车是有必要的。 （2） Its very kind of him to help us. 他帮忙我们，他真好。 Kind, nice, stupid, rude, clever, foolish, thoughtful, thoughtless, brave, considerate( 考 虑 周 到 的 ), silly, selfish(自私的) 例句: 1、It was silly of us to believe him. 我们真愚蠢，居然信任了他。 2、It seemed selfish of him not to gi...
