句型標記

時態(tài)要求

did代表一般過去時；

do/does代表一般現(xiàn)在時。

句意和例句

1.  It  is (high) time that

did/should do

是該做……的時候了

It's high time (that)kids went to bed.

2.  would  rather 后接從句

did

注：區(qū)分would  rather do

寧愿某人做……

We would rather (that)you told the truth.

3.  It  is/was strange that 從句

should do（現(xiàn)在、將來）

should have done（過去）

注：should表示“竟然、居然”，從句時態(tài)用虛擬式。

很奇怪她居然……

It was strange that he should have declined such an offer.

4.  make  sure that從句

ensure that

be sure that

guarantee that

does/do

務(wù)必要……

Do make sure that you follow the directions.

5.  in  case或for fear that后的從句

does/do或should do

以防萬一、唯恐……

Take your phone in case we contact you.

6.  no  sooner…than…或:

hardly…when…

barely…when…

scarcely…before…

前句had done（過去完成）；

后句did（一般過去）

不等……就……或：

剛剛……就……

Hardly had they reached the destination when their car broke down.

7.  It  is/was段時間since

did/had done

注：

（1）since從句后的時態(tài)要和主句對應(yīng)。

（2）有時主句也可以是it has been=it is

自從……已經(jīng)……了

已經(jīng)……那么久沒有……了

It is a couple of days since I met him on campus.

8.  It  is the first time that

has/have done

注：這個句型的識別關(guān)鍵在于主句中的序數(shù)詞。所以我們可以這樣理解：主句出現(xiàn)序數(shù)詞，后面從句就可能為完成態(tài)。

這是第……次做……

She was the first  woman who had been appointed to this position.

9.  if  only/ as if /wish

虛擬語氣，即：

現(xiàn)在：did（系動詞一律為were）

將來：did或were to do,或could、would、should、might等情態(tài)動詞。

過去：had  done

但愿/仿佛/（不切實際）希望

If only everyone could own their own houses.

10.    主句was  doing/was about to do…

when從句用過去時did

注：在這種情況下when解釋為“就在那時”。

正要/正在…就在那時…發(fā)生了

I was passing a form when I thought of visiting a friend of mine living  there.