2021屆高考英語it的用法及強調(diào)句型語法專題教案
XX年高三一輪復習金子般的學案語法部分：it的用法及強調(diào)句型（新人教版）it的用法
一、it作指示代詞
【完成句子】
用one，ones，it，that，those填空
(1) — i can't find my watch.
— you haven't found ______？ if you want to buy a new ______， i suggest you buy ______ made in china.
(2) we've 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
【結(jié)論1】
①指代上文提過的事物時，it指的是同名同物，相當于the＋名詞；
②one指的是同名異物，表示單數(shù)可數(shù)名詞相當于a ＋名詞；a / an＋形容詞＋one等于a / an＋形容詞＋名詞；復數(shù)形式用ones；
③that后面常有后置定語，有特指意義，代替不可數(shù)名詞或單數(shù)可數(shù)名詞，相當于the＋名詞；
④復數(shù)名詞用those，相當于the ones。
【例句觀察】
— someone is knocking at the door. who is it?
— it must be leo. he said he'd come to see me.
【結(jié)論2】it指代人時，常指小孩或身份不明的人。
【例句觀察】
it's too quiet in the room. everyone just keeps silent.
【結(jié)論2】it可用以指代環(huán)境或情況。
【完成例句】 [ ]
根據(jù)語境補全句子
(6)— what time is it now?
— it's half past seven.
(7)— it is spring now and it's warm these days.
【結(jié)論4】 it可用以指代時間、季節(jié)、天氣或距離。
【注意】 it指代時間時，有如下一些句型：
(1) it is time for sth. (for sb.)to do sth. / that－從句(should do / did, 必須用虛擬語氣)
例： ① it's time for lunch.
② it's time for us to clean the house.
③ it's time that we should clean the house.
＝it's time that we cleaned the house.
(2) it is / has been ＋ some time ＋ since－從句 (從句用一般過去時)
(3) it / this is the first / second…time that－從句(必須使用現(xiàn)在完成時)
這是某人第……次做了某事。
it / that was the first / second…time that－從句(必須使用過去完成時)