第1个回答 2019-07-26
下面列举sh ould不能省略的两种虚拟语气形式:l
1 在for fear that，in case，lest引导的从句中，若用虚拟语气时，从句谓语为：should+ do。should不能省略
2 虚拟语气的结构为：It is (high / about) time that + 主语+ 动词的过去式/ should + do（should不可省略）（优先使用动词过去式），即从句用虚拟过去式。
It is time that I went to pick up my daughter at school.
我该去学校接我的女儿了。
It is high time you should go to work.
你早该上班了。
句型It is 或was (high) time that +完整句子，句子的谓语动词形式用一般过去时或者should do形式且该should不可以省略。
第3个回答 推荐于2017-11-24
should 虚拟与did虚拟句型的特点
一、与事实相反的虚拟句子我们都注意到了三个公式化的句子：
1,与现在事实相反： If I had 500,000 yuan , I would buy a house in Nanning at once.
2,与过去事实相反：If you had not helped me yesterday , I would have died already .
3,与将来事实相反：If I should be a king tomorrow ，I would choose you the queen 。
省略if的倒装也是常考的要点：
1,Had I 500,000 yuan , I would buy a house in Nanning at once.
2, Had you not helped me yesterday , I would have died already .
3,Should I be a king tomorrow ，I would choose you the queen 。
二、但不是强调与事实相反，却是表示命令，要求，劝告，评价等的should从句（should可以省略）对别人下命令,提要求,建议,劝告用should,这是居高另临下对别人.我们觉得很自然His father suggested that Li ping (A.ran B .runs C.run )every morning .(只能选原形C，should 省略了）
It was asked that only German (A.could be B.would be C.be D.must be )taught in the school ..(只能选原形C，should 省略了）
在命令，要求，劝告，建议中都可以把should 翻译成“应当”但在评价性句子中貌似不是居高临下教训别人,貌似没有“应当”的意思,但其实骨子里还是好为人师,也是教育劝告,或者是对奇怪,可惜的不平之气.因此也要用should 虚拟句型。这令我们费解,要多花一些时间背句型.例：
It was important that she (A.ate B.eats C.eat D.must eat )more fruits..(只能选原形C，should 省略了）(好为人师教训别人)
It was strange that he should fail in the game .(这句最费解,没有教训别人,但有不平,不解的气愤)
It was a pity that she should lose the game .(有有不平,不解的惋惜)
三、还有表示感叹的did 虚拟句型,这个虚拟句型最令人费解,与现实事实相关不沾边,与教育劝告不平也不沾边,只与感叹现实有关.如果说should虚拟是当爷爷去教训别人的话,did虚拟是当孙子感叹不应该,不达愿望：
1，It is high time I prepared for the coming Spring Festival Party 。(感叹不应该偷懒)
2，I would rather you died tomorrow 。(感叹没达愿望,你这个讨厌的人怎么不早点死去呢?)
did 虚拟句型的特点就是感叹某人早该做某事或某事该怎样才合“我”意。did虚拟句子最让中国学生费解。本回答被网友采纳