didn't need to do表示: 過去不必做某事, 事實上也沒做。. needn't have done表示: 過去不必做某事, 但事實上做了。 John went to the station with the... [查看全文]
It is (high) time that 后面的從句謂語動詞要用過去式或用should加動詞原形,但should不可省略?!?It is time that the children went to bed. It is high time that the children should go to bed. [查看全文]
only if表示"只有";if only則表示"如果……就好了"。If only也可用于陳述語氣?! wake up only if the alarm clock rings. 只有鬧鐘響了,我才會醒。 ... [查看全文]
1)用于wish后面的從句,表示與事實相反的情況,或表示將來不太可能實現(xiàn)的愿望。其賓語從句的動詞形式為: 真實狀況 wish后 ... [查看全文]
1) It is demanded / necessary / a pity + that…結(jié)構(gòu)中的主語從句的謂語動詞要用should 加動詞原形, should 可省略。句型: (1)suggestedIt is ... [查看全文]
虛擬條件句的從句部分如果含有were, should, 或had, 可將if省略,再把were, should或had 移到從句句首,實行倒裝。 Were they here now, they could help ... [查看全文]
主句與從句的動作發(fā)生在不同的時間,這時主,從句謂語動詞的虛擬語氣形式因時間不同而不同,這叫做混合條件句?! f you had asked him yesterday, you would k... [查看全文]
1)時態(tài):可以表示過去,現(xiàn)在和將來的情況。它的基本特點是時態(tài)退后。 a. 同現(xiàn)在事實相反的假設(shè)。句型 : 條件從句 主句 一般過去時 should(... [查看全文]
真實條件句用于陳述語氣,假設(shè)的情況可能發(fā)生,其中 if 是如果的意思?!? 時態(tài)關(guān)系句型: 條件從句 主句 一般現(xiàn)在時 shall/will + 動詞原形 ... [查看全文]