write sentences using the 3rd conditional

If I had learned the rule, I wouldn`t have done the mistake in the test.

If it had rained yesterday, we would have stayed at home.

etc

If it had not been for the bad weather, we would have gone for a walk.

They would have prevented the accident, if they had made the right decision.

They would have had no end of trouble, if they had made the right decision.

вот) а сколько нужно предложений?