subjunctive mood (虚拟语气)
1.it is important that he __________ the college entrance examination.
a. should attend b. will attend c. must attend d. had to attend
8.don’t come this morning. i would rather you________ the day after tomorrow.
a. come b. came c.are to come d. will come
3._________ for the free tickets, i would not have gone to the film so often.
a.if it is not b.were it not c. had it not been d. if they were not
4.---did you meet with the famous space hero yanliwei?
---________ i had come here earlier!
a.but for b.if not c. for fear d. if only
5.without electricity human life __________ quite difficult today.
a.is b.will be c. would have been d.would be
(分析：1.a虚拟语气的一种，句式it is necessary/strange/important that …should do2.b 3.c had it not been=if it not had been 4. d. if only= i wish 要是… 该多好啊5.d)
虚拟语气是英语语法中的一种重要结构。它只存在于虚拟的情况下，通常用于表示条件、愿望或建议等，包括状语从句、主语从句和宾语从句等。理解和掌握虚拟语气的使用对于学好英语至关重要。
一、条件虚拟语气
条件虚拟语气表示所列条件是不现实或不可能发生的时候，通常使用虚拟语气。例如：
1. if i were rich, i would buy a big villa.
如果我很富有，我会买一座大别墅。
2. if he had studied harder, he would have passed the exam.
如果他学得更刻苦些，他就会考过这门考试。
这两个句子都表达了一个条件和一个结果，但都有一个假设情形。这个条件是不可能实现的，所以使用了虚拟语气。
二、愿望虚拟语气
愿望虚拟语气用于表示愿望。它可能不切实际，或者与实际不符。例如：
1. i wish i w...
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