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would of, could of, should of

would of, could of, should of

Good people please help! My brains are reaching boiling point! At Wits End

Which of the following sentences is correct:

1) "You could have done it if you have tried"

2) "You could have done it if you had tried"

3) "You could have done it if you tried"

1) "They would have come if they have had a car"

2) "They would have come if they had had a car"

3) "They would have come if they had a car"

Millions of thanx in advance!