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1. If you had studied, you could have done better on your test than me;
2. If Carl had not heard the noise, he would not have locked the door;
3. If Karen and Cindy had not taken photos, no one would have believed their story; 
4. If Max had gone to the beach, he would have competed the swimming contest;
5. If I had been nice to my coach, I would have got more help.

2. if you had studied, you  would have done better on your test then me.
3. If Carl Hadn't heard  the noise, he woudn't have locked the door/
4.If Karen and Cindy  hadn't taken photos, no  one would have believed their story/
5.If Max had gone the beach , he wold have completed the swimming contest.
6.If I had been nice to my coach, i would have got more help/