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虚拟语气可以粗略地分为两大类： 第一类：should 型虚拟式 第二类：were 型虚拟式 1.should 型虚拟式：should + 原形动词 这类虚拟式最多用在以下词或句型中： It is necessary that的主语从句中，如： It is necessary that the chief should be present personally at the meeting. 只要看到necessary，马上要想到这是should型虚拟式。 记住下面构成should型虚拟式的词： essential / important / necessary / imperative/ impossible/ natural/ preferable/ advisable/ desirable/ urgent/ incredible order / recommend/ suggest/ demand / command/ propose/ require/ request / insist/ urge / advise/ ask/ prefer/ desire/ move/ vote 由这些词构成的宾语从句，主语从句、表语从句、同位语从句或其他有关句型时，都要使用should型虚拟式，例如： It was ordered that the medicines be sent there by plane at once. The order was that the medicines be sent there by plane at once. The chief ordered that the medicines be sent there by plane at once. The order that the medicines be sent there by plane at once was sent to the branch office. | 
