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虚拟语气主要考察if引导的非真实条件句及倒装，名词性从句中的虚拟语气，wish型虚拟语气，It is (high) time的虚拟。
【实战演练】
1. It's necessary the dictionary ______ immediately.
A. that he will return B. that he returned
C. that he return D. that he has returned
【答案】C。解析：考查的是虚拟语气。句意：他必须立即归还字典。本题中考查的是it is necessary that sb. (should) do的形式，should可以省略，这是对在名词性从句中的虚拟语气的考查。故选C。
2. Albert Einstein often stressed to interviewers that his accomplishments would certainly have been achieved by others lived.
A.he had never B.never had he
C.never he had D.had he never
【答案】D。解析：考查虚拟语气条件句中省略if的用法。句意：阿尔伯特·爱因斯坦经常对采访者强调，如果没有他，别人也会取得他的那些成就。根据句中would certainly have been achieved可知，本句是对过去情况的虚拟，所以if引导的条件句应该用had done形式，由于从句中含有had，所以要省略if并把had提前，其他成分语序不变。
