主句动词:should/would/could/might+动词原形 If it should rain tomorrow, we would not go camping.
省略if的虚拟条件句 将虚拟条件从句中的were,had,should放到主语之前,构成主谓倒装 ①Should he come ,tell him to ring me up.
②Were I you,I would not do it.
③Had I been free,I would have visited you.
混合虚拟条件句 不同时间的虚拟:各遵守各的规则 ①If he had listened to me, he would not be in trouble now.
②If he had told me yesterday,I should know what to do now.
③If I were you, I would have gone to her birthday party.
虚拟与陈述的混合:各遵守各的规则 ①He could have passed the exam,but he wasn’t careful enough.
②You should have come earlier.The bus left a moment ago.
含蓄虚拟
条件句 but for+名词表示虚拟条件 句子或主句中的谓语动词的形式视具体情况而定。这是考查考生应变能力的最佳试题。 ---But for your timely warning,we ______ into great trouble.
---You know we’re friends.
A. would get
B. must have got
C. would have got
D. can’t have got
without+名词表示虚拟条件
Without the air to hold some of the sun's heat, the earth at night would be freezing cold.
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