it用法公开课[1].pptVIP

注意：it 用在不能直接跟宾语从句的动词，尤其是表示好、恶的动词，如：enjoy, like, hate, can’t help, appreciate, see to(注意到，务必) 1.I will appreciate it if you help me. 2.please see to it that you bring  enough money when you go out. * 一、用来表示时间、天气、地点、距离、环境、形势、还可指未知的人等。例如： ⒈It is two miles to the beach. ⒉It was raining in the morning. ⒊If it’s convenient, I can see you tomorrow. ⒋It was very noisy at the very moment. ⒌Someone is knocking at the door. Go and see who it is . it表示时间常用于句型： 1、⑴ It is/has been＋一段时间＋since 从句（用一般过去时态） ⑵ It was ＋一段时间＋ since 从句 （用过去完成时态） 用meet 的适当形式填空 例如： 1）It is/has been many years since I you last in London. 2）It was a long time since I you last in London. met had met It is five months since I arrived in New York. 我到纽约已经五个月了。 It is five months since I was in New York.我离开纽约已经五个月了。 （注意：终止性动词表示从动作发生时算起；如果是状态动词或持续性动词，则从动作或状态结束时算起。） 2、⑴ It is/ will be + 一段时间 + before 从句(用现在时态) ⑵It was +一段时间+before从句 （用一般过去时态） 表示“在（做某事）前过了多长时间”，或“过了多长时间才……”。如： But it ________more than 100 years before the country begins once again to look as it did before. will be 二、用作人称代词，代替前文提到过的事物 如： The train has arrived. It arrived half an hour ago. 注：区分 it one that 1. I was disappointed with the film ，I had expected _______ to be much better． A．that B．this C．one D．it 2. I prefer a flat in Inverness to _______ in Perth, because I want to live near my Moms.A. one B. that C. it D. this 3.The air of a suburb is cleaner than __of a city. A. one B. that C. it D. those 三、指代不定式、动名词、从句等，用作形式主语或形式宾语。如： ⑴ It is not easy to finish the work in two days. ⑵It is no use crying over spilt milk. ⑶It is a pity that you didn’t read the book. ⑷I think it no use arguing with him. ⑸I found it very interesting to study English. ⑹He made it clear that he was not