虚拟语气5

虚拟语气用于 名词性从句 之

表语从句及同位语从句

1) as if /though（似乎，好像，仿佛）引导的表语从句如果表示与现在事实相反，谓语动词用一般过去时；表示与过去事实相反，谓语动词用过去完成时；表示与将来事实，谓语用would /might/ could+动词原形。

It is so cold that it seems as if we were in Siberia. 天真冷好像我们到了西伯利亚似的。

It looks as if it might rain. 看起来好像要下雨。

2) 当表示间接的要求、建议、命令、决定、欲望、劝告、主张等名词作主语时，其表语从句用虚拟语气。这类名词有suggestion, proposal , request, order, advice, idea, demand, recommendation等，其谓语用(should)＋动词原形。

My suggestion is that we (should) do the experiment again. 我的建议是我们应该再做一次实验。

My idea is that he (should) do his homework first. 我的想法是他先做作业。

His proposal is that they (should) challenge the other groups to a friendly competition. 他的建议是他们向别的组挑战进行一场友谊竞赛。

上述名词的同位语从句也用虚拟语气，其谓语用(should)＋动词原形。

My suggestion that we (should) do the experiment again is accepted by him. 我提出的我们应该再做一次实验的建议被他们所接受了。

His proposal that they (should) challenge the other groups to a friendly competition is praised by the teacher. 他提议他们向别的组挑战，进行一场友谊竞赛，受到老师的赞同

Tip: 如果不表示建议、命令、愿望等意义时，表语从句及同位语从句中不用虚拟语气，而用陈述语气。