虛擬語氣在從句中的運(yùn)用
虛擬語氣在名詞性從句中的運(yùn)用：
A）用於賓語從句中。
wish +從句，表示不可能實(shí)現(xiàn)的願望。
wish that…had done…（過去）
wish that…did/were… （現(xiàn)在）
wish that… would/could do…（將來）
如：
We wish we had arrived there two hours earlier.
I wish I were a bird.
I wish you could come tomorrow.
用於表示建議、願望、命令等詞後的賓語從句中，常見的動詞有：suggest, insist, command, advise, desire, order, request, require, demand that…(should) do…
例句：
We insisted that she (should) go with us.
He suggested that we (should) start off early the next day.
The doctor ordered that the patient ( should ) be sent to hospital without delay.
They insisted that the boy (should ) go with them.
注意：儅suggest表示“暗示、表明”之意時，不用虛擬語氣，應(yīng)用陳述語氣。如：
The smile on his face suggested that he was satisfied with out work.
儅insist表示“堅持認(rèn)爲(wèi)”之意時，不用虛擬語氣，應(yīng)用陳述語氣。如：
The man insisted that he had never stolen the money.
在would rather, had better 後的賓語從句中，也用虛擬語氣，其搆成爲(wèi)動詞過去式。如：
I would rather they didn't hear of the news.
B) 用於主語從句中
It is desired /suggested /proposed/necessary/important/strange/natural/a pity + that 從句。從句中的謂語動詞用“should + 動詞原形”，should 可以省略。如：
It is suggested that the meeting should be put off till next week.
It is strange that he should have acted toward his parents like that.
注：以上句式也可以用陳述語氣。如：
It's strange that he didn't come yesterday.
It's a pity that you can't dance.
C) 用於表語從句和同位語從句中。
在suggestion, proposal, order, plan, idea, request, advice等名詞後的表語從句和同位語從句中要用虛擬語氣。其搆成是“should + 動詞原形”。如：
My idea is that we should think it over before accepting it.
We all agreed to his suggestion that we should go to Dalian for sightseeing.
三、虛擬語氣用在as if (as though), even if (even though)等引導(dǎo)的表語從句或狀語從句中。
表現(xiàn)在：用過去時；表過去：用過去完成時態(tài)；表將來：用過去將來時態(tài)。如：
He looks as if he were an artist.
She speaks English so fluently as if she had studied English in Ameirca.
Even if he were here, he could not solve the problem.
四、虛擬語氣用於定語從句中。
It is (high) time (that)……（此句型意爲(wèi)“現(xiàn)在該……”，用來表示提議）句型中，定語從句的謂語動詞用過去式，或should + 動詞原形（其中should 不能省略）。如：
It is (high) time that you went to school.
It is (high) time that we should start now.
五、用於if only 引導(dǎo)的感歎句中。
If only I were a flying bird!
If only I had seen the film!
六、在含有If it were not for或If it had not been for條件句的虛擬語氣中。
If it were not for the rain, the crops would die.
If it had not been for your help, we couldn't have finished the work ahead of time.
七、用於表示委婉語氣的句型中。
It would be better for you not to do that.
Would you be so kind as to show me the way to the railway station?
Could you please help me with this heavy bag?
八、用於“may + 動詞原形”表示“祝願……”，may 須置於句首。
May you succeed!
May you be happy!