10 statements with the word "may"
10 statements with the word "might"
10 statements with the word "could"

Oh, lord. 
MAY- 
1. She may have thought you said "no". 
2. You may not want to do that. 
3. He may never know what she meant by that. 
4. May the rain wash the car so I don't have to. 
5. He may not think so. 
6. They may not know what to do. 
7. He may touch the objects, as long as his hands are clean. 
8. She may have learned her lesson from getting sick. 
9. They may not appreciate that. 
10. Sarah may take the opportunity to get some free food. 

MIGHT-
1. I might do that. 
2. They might not appreciate that. 
3. She might get mad when you touch that. 
4. They might get you in trouble. 
5. You might not want to touch that.
6. He might hurt himself. 
7. You might get cold out there. 
8. She might break up with you if you do that.  
9. There might be a bug in your drink. 
10. They might leave if you play that kind of music. 

Could-
1. He could die from that. 
2. They could get seriously injured from that. 
3. She could get life in prison. 
4. He could get in trouble if he touches that. 
5. They could possibly get sick if they keep eating. 
6. Gary could say "yes".
7. She could die from eating that plant. 
8. They didn't think she could do it. 
9. Tony could do it if he wanted to. 
10. He could not stop laughing. 

I hope this helps...