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译林2003课标版《Grammar and usage(1)： Unreal conditions》精品PPT课件优质课下载
主句的谓语形式
表示现在情况
过去式(did)
(be常用 were)
Would / could / might / should (用于第1人称) +动词原形(do)
表示过去情况
过去完成式
(had +done)
Would / could / might / should +have done
表示将来情况
①过去式 (did)/(were)
②should + do
③were to do
Would / could / might / should + do
2、省略 if 的条件从句
当从句中有 were, had 或 should 时，可省略if ，而把它们放在句首。
If I were to meet him tomorrow, I should ask him about it.
Were I to meet him tomorrow,…
If he should fail in the experiment this time, he would try again.
Should he fail in the experiment…
If you had come a few minutes earlier, you would have met. Had you come a few….
. 3 . If only …要是就好了
If only I knew his name!
If only we had followed your advice!!
If only I could see him again!