高考英语语法的试题讲解：虚拟语气主语从句使用
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虚拟语气用于主语从句中
在It is (was)important (necessary, desirable, imperative, advisable, incredible, urgent, possible, essential, natural, preferable, insistent, crucial, better, best, ridiculous, vital) that…能及It is (was) a pity (shame, wonder, must, suggestion, proposal, requirement, request, desire, order, recommendation) that….,It is (was)desired (arranged, decided, ordered, proposed, requested, recommended, suggested, settled) that…等句型的主语从句中，其谓语用“should+动词原形(其中should可以省略)”来构成虚拟语气。
例：It is important that we (should)speak politely.
我们说话要有礼貌，这是很重要的。
例：It is essential that she these application forms be sent back as early as possible.
将这些申请表格尽快地反馈回来是很必要的。
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