Can any one help me to find out the exact meaning of the following words and the places that they can be used
1. did not
2. didn't
3. could not
4. Couldn't
5. Should not
6. Shouldn't
7. can not
8. can't
9. are not
10. aren't
11. ain't

Regards,
N.Yuvaraj

Sorry, do your own homework. Good luck with the rest of your studies.