Conditionals >> Third conditional

Structure of third conditional
If I'd (I had) known you were coming, I would've (would have) waited for you.	If she hadn't been ill, she would have gone to the cinema.	Would you have done it if you'd (you had) known earlier?

Third conditional - common mistakes
Common mistakes	Correct version	Why?
If I would have asked him, he would have helped me.	If I had asked him, he would have helped me.	In the if-clause we use the past perfect (had + past participle).
If you had spoken to my mother, she would tell you where I was.	If you had spoken to my mother, she would have told you where I was.	The main clause has would + have + past participle.

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