2017届高三英语一轮复习课件（安徽用）考点14 It的用法

　　Part2 考点14 考点14

　　It的用法 1.主要考查的知识点： 　(1)it作形式主语、宾语　(2)it强调句的结构 　(3)it的其他固定用法 2.复习重点： 　(1)it作形式主语、宾语的用法 　(2)it用于强调句的用法　(3)it的固定句型 1. it作人称代词的用法 (1) It's a tree.

　　(2) I have a new bike. It (＝ The bike) was given to me as my birthday present by my parents.

　　(3)— Who is it knocking at the door? — It must be Leo. He said he'd come to see me. (4) It is spring now and it's warm these days. (5) It's time that we should clean the house. ＝It's time that we cleaned the house. 1. it作人称代词的用法 (6) It is three years since I became a doctor.

　　我当医生已经3年了。

　　(7) It is three years since he was a doctor.

　　他不当医生已经3年了。 (8)It is the second time that she has visited the Great Wall. 1. it作人称代词的用法 (9)It was evening when we got home. ＝It was evening in which we got home. (10) It was five years before they finally graduated from Beijing University.

　　过了5年他们才从北大毕业。 (11) It won't be long before we graduate from our school.

　　不久，我们就要从学校毕业了。 1. 指代除了人以外的一切事物，如：(1)。 2. 指代上文提过的事物，相当于“the ＋ 名词(单数)”或替代上文的this / that，意指同类同物，如：(2)。 3. 指代人时，常指小孩或身份不明的人，如：(3)。 4. 指代时间、季节、天气、温度、距离、环境、情况等自然现象，如：(4)。 【注意】

　　it指代时间的句型有： (1)It is time for sth. / (for sb.) to do sth. / that­从句(should do/ did，必须用虚拟语气)，如：(5)。 (2)It is /has been ＋ some time ＋ since­从句 (从句用一般过去时)

　　此句型中，若从句的谓语为非持续性动词，句意为“自从……以来已有多长时间了”；若从句的谓语为持续性动词，句意为“有多长时间没有做……了”，如：(6)、(7)。 (3)It / This is the first /second…time that­从句(必须使用现在完成时)句意为“某人第……次做了某事”，如：(8)。 (4)It was ＋时间点 ＋ when­从句，句意为“当……时，已经是……时间了”，如：(9)。 (5)It was / will be ＋ some time ＋ before­从句，句意为“过了……时间才……”；其否定句It wasn't / won't be ＋ some time ＋ before­从句，句意为“没过……时间就……”，如：(10)、(11)。 2．it作非人称代词的用法 (1) It is good for you to take part in social activities. (2) It looks as if he is ill.

　　(3) It happened that Mary was there too. (4) It seems that he is right.

　　(5) How did it come about that so many people were attacked? (6) Mobile phones make it possible for us to keep in touch anywhere. 2．it作非人称代词的用法 (7) I consider it no good chatting with strangers through the Internet. (8) I really find it a pity that you didn't come to the party. (9) I hate it when people speak with their mouths full. (10) I really appreciate it if you could help me with my math. (11) You can depend upon it that we won't give up. (12) It was Edison who invented the lamp. 2．it作非人称代词的用法 (13) It is I that am going to be sent there. (14) He didn't go to bed until_he_finished_his_homework. → It wasn't until he finished his homework that he went to bed.

　　(15) It was because he got there late that we didn't catch the first bus.

　　(16) Was it not until he finished his homework that he went to bed? (17)When was it that he went to bed? 1．it 作形式主语

　　当不定式、动名词短语或从句作主语时，为平衡句子，通常用it 作形式主语，而将真正的主语移到句子的末尾，如：(1)。

　　用于某些固定句型中： ①It looks / sounds as if­从句，句意为“看起来好像……；听起来好像……”，如：(2)。 ② It happens that­从句，句意为“碰巧……”，如：(3)。 ③ It appears / seems that­从句，句意为“看来…”，如：(4)。 ④ How did it come about that­从句，句意为“……怎么发生的？”，如：(5)。 ⑤ It is no good/use doing sth. 句型，句意为：“……没有用。” ⑥ It doesn't matter/ makes no difference ＋ 特殊疑问词/whether / if ­从句。 ⑦ It turned out that­从句，意为“结果是……，证明是……”。 ⑧ It occurred to / hit sb.that­从句，意为“某人突然想到了……”。 ⑨ It is no/little wonder that­从句，意为“难怪……”。 2．it 作形式宾语

　　当不定式、动名词短语或从句作宾语时，有些情况须用it 作形式宾语。 ① think / consider / find / feel / make / believe / regard ＋ it ＋ adj./n. (for sb.) ＋ to do，如：(6)。 ② think / consider / find / feel ＋it＋ no good / use doing sth.，如：(7)。 ③ believe / imagine / think / consider / find / feel / (make) / regard / ＋it＋ adj. / n. ＋ that­从句，如：(8)。 ④ hate / dislike / love / like ＋it ＋ when­从句，如：(9)。 ⑤ appreciate ＋ it＋ if­从句，如：(10)。 ⑥ see to/ answer for it＋ that­从句；depend on it ＋that­从句，如：(11)。 3．it引导强调句型

　　强调句结构

　　“It is / was ＋ 被强调部分 ＋ that / who ＋ 句子的其余部分”。

　　It是引导词，被强调部分可以是句子的主语、宾语、状语。如果被强调的部分是人，that 可用who代替，其他情况一律用that；原句中用的是过去的某种时态， 用it was…that/who…，原句中用的是现在或将来的某种时态，用it is…that，如：(12)。

　　【注意】 ① 强调句中的被强调部分不能是定语或谓语。 ② 在强调句型中，当强调主语时，that后面的谓语动词须与that前面的主语一致，如：(13)。 ③ 在not…until…结构中，若强调until部分时，not 要提前到until前，until后面的部分一起被强调，即：It wasn't until…that ＋句子的其余部分，如：(14)。 ④ 当强调原因时，只能强调because引导的原因状语从句，而as, since, for等连接原因不能被强调，如：(15)。 ⑤ 强调句的一般疑问句形式：Is/Was it ＋ 被强调部分 ＋ that ＋ 句子的其余部分，如：(16)。 ⑥ 强调句的特殊疑问句形式：特殊疑问词＋ is/was it＋ that ＋ 句子的其余部分，如：(17)。 4．it 的一些习惯用法 ① (You've/I've) Got it. 懂了，明白了。 ② Forget it 算了吧，别在意，没关系。 ③ Take it easy. 别着急，慢慢来；别过于紧张。 ④ make it 办得到，做成功 ⑤ make it ＋时间 把……定在(某时) ⑥ It / That (all) depends. 那要看情况而定。 ⑦ It can't be helped. 没有办法/这是不可避免的。 ⑧ It is hard to say. 情况很难说。 ⑨ It comes to nothing. 没有什么结果。 ⑩ Don't mention it. 不用谢。 ⑪ That's it. 对了；正是。 ⑫ catch it (口语) 被责骂； 受处罚 ⑬ Believe it or not. 信不信由你。 ⑭ It doesn't matter. 没有关系； 不要紧。 ⑮ When it comes to …当谈到……； 当涉及到…… ⑯ keep it up 再接再厉 5. it, one, ones, that和those的区别

　　it指的是同名同物，相当于the＋名词；

　　one 指的是同名异物，表示单数可数名词相当于a ＋名词；用作a/an＋形容词＋one，等于a/an＋形容词＋名词；复数形式用ones；

　　that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；

　　复数名词用those，相当于the ones。