2019屆高考英語代詞第二輪備考復習教案
it was not until she took off her dark glasses that i realized she was a famous film star.
= not until she took off her dark glasses did i realize she was a famous film star.
= i didn't realize she was a famous film star until she took off her dark glasses
2. it is clear ( obvious, true, possible, certain…) that …
it is very clear that he's round and tall like a tree.
= that he's round and tall like a tree is very clear.
3.it is suggested ( ordered, required ... ) that ...
4.it is time ( about time , high time ) that ...
該句型中that 后的從句應該用虛擬語氣，值得注意的是① 常用過去時態表示虛擬.② 有時也用should + 動詞原形，should 不能省。常譯為“是（正是）……的時侯……”。
it is time that children should go to bed.
= it is time that children went to bed.
5. it is the first ( second … ) time that …
該句型要和上一個句型區別開來。該句型中的 that 從句不用虛擬語氣，而用完成時態。至于用什么完成時態，由主句的謂語動詞的時態決定。如果是一般現在時，后面從句用現在完成時態；如果是一般過去時，后面從句則用過去完成時態。該結構中 that 可以省去；it 有時用 this 替換，常譯為“是第一（二）……次……”。
it is the first time i have been here.
6.it is … since ...
該句型主要用作處理瞬 間動詞的完成時，又要和表示一段時間的時間狀語連用的問題。主句中是時間作表語，其時態是現在時或完成時，since 引導的從句通常是一般過去時態，而且是瞬間動詞。如果主句是一般過去時，從句則用過去完成時。
it is ( has been ) 5 years since his father died.
7. it is ... when ...
該句型中的 when 引導的是一個時間狀語從句，主句中的 it 指時間，表語由具體的時間充當。常譯為“當……的時候，是……”。
it was 5 o'clock when he came here.
8. it be ... before ...
該句型主句中的 it 指時間, 主句中的時態常是將來一般時或過去時兩種時態.主句中的表語多是long, not long , 3 days , 2 weeks 等表示時間段的詞或短語。常譯為“……之后……”。
it was 3 days before he went to beijing.
it will be not long before he finishes his job.
9. it happens (seems, looks, appears ) that...
該句型中it是形式主語，that 引導的是主語從句，主句中的happen, seem 等詞是不及物動詞.
it happened ( so happened ) that he met his teacher in the street.
it seems that he will be back in a few days.
10.we think it important to learn a foreign language.
該句型中的it 作形式賓語。為了記憶方便我們可稱該句型為：
6123結構