1.Students should  be allowed to have part-time jobs.
否定句：Students should not be allowed to have part-time jobs.


一般疑问句 ：Should students be allowed to have part-time jobs
回答：No.they shouldn't.否定   Yes,they should.肯定


2.Sixteen-year-olds should be allowed to choose their own clothes
否定句：Sixteen-year-olds should not be allowed to have part-time jobs.


一般疑问句 ：Should sixteen-year-olds be allowed to choose their own clothes?
回答：No.they shouldn't.否定   Yes,they should.肯定