初三英语句型转换1.I think students should be allowed to do homework

初三英语句型转换
1.I think students should be allowed to do homework with friends(改为否定句)
I ( )( )( )( )be allowed to do homework with friend.
2.Sixteen year olds should beallowed to drive.(改为否定句)
Sixteen year olds ( )( )( )( ) drive.
3.He should (cut his hair .)(对括号里的提问)