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在宾语从句中应用
在表示命令、建议、要求等一类动词后面的从句中。
order, suggest, propose, require, demand, request, insist, command, insist + (should) do
e.g. I suggest that we (should) hold a meeting next week.
e.g. He insisted that he (should ) be sent there.
如suggest, insist 表 “暗示、表明”、“坚持认为”时，宾语从句用陈述语气。
判断对错
①You pale face suggests that you (should) be ill.
②Your pale face suggests that you are ill.
在同位语从句和表语从句中应用
在suggestion, proposal, idea, plan, order, advice等名词后面的表语从句、同位语从句中要用虚拟语气，即（should）+动词原形。
①My idea is that we (should) get more people to attend the conference.
②I make a proposal that we (should) hold a meeting next week.
在主语从句中应用
it is + adj. ，当形容词是advisable, critical，crucial, desirable, essential, imperative, important, incredible,, 等, 主语从句多用虚拟语气，
现在时，v用should/would +动词原形(should/would经常省略)；
过去时，则用should/would + have done的形式。
