use of Can and May?????

1. Can  you can the vegetables in the can?Yes.I can.
2. Can I come in? sure, why not?
3. Can You call the doctor? yes
4. Can We see the flat? yes,sure.
5. Can he paint the picture? No.He can't.
6. Can I dance with you? yes, please.
7. Can I come with you?not now. some other time
8. May I come in? yes.please do.yes.
9. May I dance with you? yes
10.  May I paint the picture now? yes
11.  May I see that apartment? yes
12. May I call the doctor? yes,please do.Thank you.