在主语从句中,谓语动词的虚拟语气用“(should+)动词原形”的结构,表示惊奇、不相信、理应如此等。
It is necessary (important,natural,strange,etc.)that we (should) clean the room every day.
It was a pity (a shame,no wonder,etc.)that you (should) be so careless.
It will be desired (suggested,decided,ordered,requested,proposed,etc.)that she (should) finish her homework this afternoon.
注意:这种从句表示的是事实。如果人对这种事实表现出惊奇的情感,就可用虚拟语气;反之,如果不表示惊奇等情感,that从句也可用陈述句语气。
It is a pity that you can’t swim.
3.虚拟语气在其他场合的运用
(1)虚拟语气在as if/as though,even if/even though等引导的表语从句或状语从句中,如果从句表示的动作发生在过去,用过去完成时;指现在状况,则用一般过去时;指将来状况则用过去将来时。
He did it as if he were an expert.
Even if she were here,she could not solve the problem.
(2)虚拟语气用于定语从句中。
这种从句常用于句型“It is (high)time (that)...”中,定语从句的谓语动词用一般过去时(be用were)或“should+动词原形”,意为“(现在)该……”。
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