1.在wish后面的宾语从句中用虚拟语气,从句谓语向前推一个时态。如:
I failed in the exam.I really wish I had known the answers.
在it is wished that引导的主语从句以及名词wish后面的表语从句、同位语从句中也要用虚拟语气,谓语的形式同wish后面宾语从句的形式。如:
It is wished that man could fly freely in the sky.
注意:wish的时态和后面从句的时态无关。
2.在insist(坚决要求)/suggest(建议)/recommend/propose/order/demand/require/request等后的宾语从句中要用虚拟语气,从句谓语用(should)do的形式。如:
He suggested that we (should)start at once.
在it is suggested/proposed that引导的主语从句以及名词insistence/suggestion/proposal/order/demand等后面的表语从句、同位语从句中也要用虚拟语气,谓语的形式同这些名词相应的动词后面宾语从句的形式。如:
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。
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