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必修5《Grammar Summary》PPT课件优质课下载
3、subjunctive in subject clause
4、subjunctive in some special occasions
If I had a lot of money,
I would buy a villa.
If clause
Three different situations(contrary to the real situation)
Time
Verb form in if-clause
Verb form in main clause
present
past
future
Past simple(did)
(be-were)
would / could / might / should+ verb
Past perfect(had +done
Would/could/might/should+have+done
①past simple(did)
②should + do
③were to + do
would/could/might/should+verb
notes：1.Mixed conditionals—conditionals where the tenses in the main clause are different from the tenses in the if-clause
The verb forms of the main clause and if-clause depend on their own tenses
If you had asked him yesterday, you would know what to do today.
2.In second and third conditionals ,the past simple of “be” should only be in the form of “were”