2017年高考英语it的用法及强调句型1.docVIP

it的用法 一、it作指示代词 【完成句子】 用one，ones，it，that，those填空 1 — I cant find my watch. — You havent found ______？ If you want to buy a new ______， I suggest you buy ______ made in China. 2 Weve got a big cup and two small ______. 3 The weight of an elephant is much greater than ______ of a tiger. 4 The books on the first shelf are easier than ______ on the second shelf. 5 The boy told his story and ______ of the girl upstairs. 【答案】 1 it; one; one 2 ones 3 that 4 those / the ones 5 that / the one 【结论1】 ①指代上文提过的事物时，it指的是同名同物，相当于the＋名词； ②one指的是同名异物，表示单数可数名词相当于a ＋名词；a / an＋形容词＋one等于a / an＋形容词＋名词；复数形式用ones； ③that后面常有后置定语，有特指意义，代替不可数名词或单数可数名词，相当于the＋名词； ④复数名词用those，相当于the ones。 【例句观察】 — Someone is knocking at the door. Who is it — It must be Leo. He said hed come to see me. 【结论2】it指代人时，常指小孩或身份不明的人。 【例句观察】 Its too quiet in the room. Everyone just keeps silent. 【结论2】it可用以指代环境或情况。 【完成例句】 根据语境补全句子 6 — What time is it now — Its half past seven. 7 — It is spring now and its warm these days. 【结论4】 it可用以指代时间、季节、天气或距离。 【注意】 it指代时间时，有如下一些句型： 1 It is time for sth. for sb. to do sth. / that－从句 should do / did, 必须用虚拟语气 例： ① Its time for lunch. ② Its time for us to clean the house. ③ Its time that we should clean the house. ＝Its time that we cleaned the house. 2 It is / has been ＋ some time ＋ since－从句 从句用一般过去时 3 It / This is the first / second…time that－从句 必须使用现在完成时 这是某人第……次做了某事。 It / That was the first / second…time that－从句 必须使用过去完成时 例：①It is the second time that she has visited the Great Wall. ②This was the first time that I had come late to school. 4 It was ＋时间点 ＋ when －从句 例： It was evening when we got home. ＝It was evening in which we got home. 5 It was / will be ＋ some time ＋ before －从句 例：①过了5年他们才从北大毕业。 It was five years before they finally graduated from Beijing University. ②不久，我们就要从我们学校毕业了。 It wont be long before we graduate from our school. 二、it作形式主语 【完成例句】 根据语境补全句子 8 It is possible for me to make a tour around the world. 【结论】代替由不定式、动名词或从句所表示的真