1. Can't (cannot)
2. Couldn't (could not)
3. Don't (do not)
4. Didn't (did not)
5. Isn't (is not)
6. Wasn't (was not)
7. Shouldn't (should not)
8. Wouldn't (would not)
9. Hasn't (has not)
10. Haven't (have not)
11. Won't (will not)
12. Ain't (am not/are not/is not)
13. That's (that is)
14. What's (what is)
15. Where's (where is)
16. Who's (who is)
17. It's (it is)