高中英语 unit 3 A healthy life 语法it的用法学案 新人教版选修.doc

It的用法（学案） 1．代替上文中提到过的人或事物。指代人时，一般用于小孩或身份不十分明朗的人。 例如： －Who is the baby? －It’s my teacher’s son． －Who is that gentleman? －It’s my friend, Tom．He (不可用It) wants to see you． 【典型例题】 (NMET2001) The Parkers bought a new house but _____ will need a lot of work before they can move in. A. they B. it C. one D. which 2．用于表达时间，距离，天气、环境等。 ◆ It’s half an hour’s walk from here to our school．此处it 指代的是_________. ◆ It’s nice and warm here．But it’s two o’clock now, and it’s time for us to go to school． 此处it分别指代__________, ___________, ____________. 注意下列几种表示时间的句型 ①.It is (high/about) time that… ◆（翻译）是我们离开去上海的时候了。___________________________________________. ②.It is the first ( second ... ) time that … ◆（翻译）这是我第一次被表扬。_________________________________________________. ③.It is .... since ... ◆（翻译）他们结婚三年了 _________________________________. ④.It is / was ... when ... ◆（翻译） 中华人民共和国(PRC)是在1949年成立的。___________________________________. ⑤.It is / was ... before ... ◆（翻译）我们下次再见要两年以后了。________________________________________________. 3. it 作形式宾语，来代替真正的宾语（不定式，动名词或从句），以使句子保持平衡。 为了记忆方便我们可称该句型为“6123结构”。?6 指主句中常用的动词：think, believe, make, find, consider, feel；?1 指的是形式宾语 it；　?2 指的是宾补的两种形式：形容词或名词；?3 指的是真正宾语的三种形式：不定式短语, 动名词短语或 that 引导的宾语从句。 例：We think it important to learn a foreign language. 在该句中动词是_______, 形式宾语是______, 宾补是______, 真正的宾语是________________ 1.We considerd ____ logical that not all plans can be put into practice. A. that B.quite C. it D.very 2.I hate ________when young people speak to the elderly in a rude way. A. this B.that C.it D.one 4. 为了保持句子平衡，避免头重脚轻，it作形式主语，来代替真正的主语(不定式,动名词,从句). ① It is +adj.+ ( for sb. ) to do sth. (A) It is +adj. + (of sb.) to do sth. ( B) 在句型A中，形容词是用来修饰事情的形容词；如important, necessary, natural 或者easy , safe , common , normal , hard , difficult ,dangerous , unusual, rare , impossible , pleasant等。 如：对她来说参加派对很重要。________________________________ = It is important that she (should ) come to the party 在句型B中，形容词必须是能表示逻辑主语特