1.A.may l open the door?B.no you can't ,because the door is broken
2.is it necessary to close the windows?B.no ,you needn't ,my can do .
3.A.may I sit?B.yes,you can.
4.A.may I answer the question ?B.no you can't
5.A.may I take the book?B.No, you can't
6.A.may I go to walk ?B.yes,but don't be late.
7.A.may I wear this jeans at school?B.no,you can't wear jeans at school.