it的用法

nullnullnullIt的用法归纳： 1、指代的作用 2、形式主语/宾语 3、强调句 4、与it相关的句型 null1、指代的作用① 人称代词，代替前文提到的人或事。 This bike is not mine. It’s Peter’s. —Is the baby a boy or a girl?　　 —It’s a boy. null注意：it, that, one都可代替前面提到的人或事it 用来代替前面提到的可数名词，所指的是事物本身； that 用来代替不可数名词，或代替特指的单数可数名词； one 代替前面出现过的单数可 数名词，泛指nullI can’t find my pen anywhere. I must have lost it. Life today is much better than that in the old days. I can’t find my pen. I’m going to buy one. null② 用以代替提示代词this, that — What is this? — It’s a pen. — Whose pen is that? — It’s Jim’s. null③ 指代性别不明或性别被认为不重要的人。 —Who is knocking at the door? —It’s me. Whose baby is it? It’s very lovely.null④ 指天气、时间、距离、自然环境等。* It was very cold in winter. * It’s seven o’clock. * What a long way it is from Beijing to London! * It was quiet at night. null⑤ it 指代整个句子所表达的意思。 　She failed the examination and it made her parents worried. null⑥ 某些短语中，it无具体含义 Do you like it here? I can make it. take it easy 慢慢来； that’s it 就这样，这就对了 got it 明白null2、形式主语/宾语It is not easy to finish it in 2 days. It is no use arguing with him. It is clear that he didn’t know it. I don’t think it easy to study English. I think it no use arguing with him. He made it clear that he didn’t know it.null注意① see to it that…（务必,确保) take it for granted that…(想当然) 　　 Can you see to it that everything is ready? I just took it for granted that he would always help us.null注意② I hate it when people talk with their mouth full.hate/ dislike/ like /love/ enjoy/ prefer/ appreciate形式宾语it真正的宾语null注意③　主语从句中的虚拟语气 It is necessary/ important/ strange that sb. (should) do sth. It is a pity/ a shame that sb. (should) do sth. It is desired/ requested/ required/ suggested/ proposed/ ordered/ that sb. (should) do sth.null3、it 用于强调句It was an old friend who/ that/ whom I met in the park yesterday. It was in the park that I met an old friend yesterday. It was yesterday that I met an old friend in the park.null4、与it相关的句型① It was + 某一时刻 +when… “当……的时候，时间是……” It was 6:00 when I came home.null4、与it相关的句型② It was + 一段时间 + before… “过了多久才/就……” It will be + 一段时间 + before… “要过多久才/就……”It was an hour before I came back. It will be an hour before I come back.null4、与it相关的句型③ It is /has + 一段时间 +since… “自从……有多久”注意：句中用 is 或 has 均可nullIt is 3 years since he was a soldier. It is 3 years since he joined the army.他退伍已三年了。他入伍已三年了。nullIt is 3 years since I worked there. It is 3 years since I began to work there.我不在那工作已三年了。我在那工作已三年了。nullsince 从句中的谓语动词为短暂性动词时，意为：从这一动作开始以来有多久。 而当动词为延续性动词时，则表示：不做该动作（即动作的结束）以来有多久。null④ 在表示“第几次做某事”时，注意时态的使用 　　 It is the first time that I have visited Beijing. It was the first time that I had visited Beijing.null⑤ It is ( high ) time that … “该做某事的时候到了” 　 　 It is high time that I went to school. It is high time that I should go to school.null⑥ It is likely that … “很可能……” 　 It looks as if … It seems /appears that … It is no wonder that …