Their proposal is that their output (should) be increased by 20%.
3.在it is necessary/important/possible/strange/no wonder/a pity/a shame等后面的主语从句中要用虚拟语气,谓语用(should) do 的形式。如:
It is necessary that he (should) be sent there at once.
4.在it is time that后面的从句中用虚拟语气,谓语用过去式或should do的形式,should不可省略。
It is time that we went / should go to bed.
5.在as if / as though后面的从句中也常用虚拟语气。
She always talks to me as if she were my sister.
【典例分析】 (2012辽宁高考,33)Jack is a great talker.It's high time that he ______ something instead of just talking.
A.will do
B.has done
C.do
D.did
答案为D项。句意:杰克是个空谈家。到了他做点事而不是夸夸其谈的时候了。it is high time后面的从句中要用虚拟语气,其谓语动词多用一般过去时,或should do的形式,should 不能省略,故只有D项正确。
(2012北京高考,35)Don't handle the vase as if it ______ made of steel.
A.is
B.were
C.has been
D.had been
答案为B项。在as if 引导的条件句中应用虚拟语气,表示与现在事实相反时用一般过去时,而且不论第几人称,be动词都用were。句意:不要对待那些花瓶好像他们是由钢制成似的。
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