2008高考英语专题复习 it的基本句形 ppt.pptVIP

　的基本用法 1．用作代词 2．用作先行词 ３．强调句型 * 1）That vase is valuable. It’s more than 200 years old. 那个花瓶很珍贵，它有200多年的历史。 2）I love swimming. It keeps me fit.? 当说话者不清楚或无必要知道说话对象的性别时， 也可用it来表示。 3）It’s a lovely baby. Is it a boy or a girl? it可用来指代团体。 4）The committee has met and it has rejected the proposal.? 委员会已开过会，拒绝了这项建议。 it用以代替指示代词this, that. 5）--- What’s this? ? ? --- It’s a pen.?????????????? 6） --- Whose book is that? ? --- It’s Mike’s.? 1.指代事物或前面提到过的事物 2.指人 Who is it? It’s me. 3.表示气候 It is cold today. It often rains here in summer. What was the weather like yesterday? It was fine. --- Who is making such a noise?? --- It must be the children.? 4.表示时间或季节 5.表示距离 It is seven o’clock now. What day is today? It’s Friday. What season is it? It’s spring. How far is it from the school to your home It is twenty miles from here to the village How is it going with you? Where does it hurt? ６．表示情况 Take it easy. it充当形式主语或形式宾语，本身无意义， 只起一种先行引导的作用，先行词不重 读。后面的真正主语或真正宾语通常 是不定式结构、-ing分词结构或 名词性从句。 形式主语 形式宾语 it常用来代替不定式,动名词或名词性从句作形式 主语,位于句首,而被代替的真正主语置后. It + be +表语+ 不定式 It is easy to climb the hill. It is his duty to settle the problem. It is not proper to do so. 在上述诸例中，后置的真正主语可以取代先行 it的位置，而出现于句首。 To climb the hill is easy. To settle the problem is his duty. To do so is not proper. It + 谓语 + 动名词短语 It is no good arguing with him. It is no use crying over spilt milk. It is exciting working here with you. Arguing with him is no good. Crying over spilt milk is no good. Working here with you is exciting. 在上述诸例中，后置的真正主语可以取代先行 it的位置，而出现于句首。 It is clear that she is the best student In the class. It’s a pity that you can’t go with her. It’s certain that he’ll get on well with her. It is said that he is doing fine in school. It doesn’t matter whether he comes or not. It + 谓语 + 名词性从句 1.It is a pity that…. It is a fact that…. It is a wonder that…. It is no wonder that…. 2.It seems that…. It appears that…. It turned out that….