presents(+should,shouldn't,must,mustn't)be things people use
presents(+should,shouldn't,must,mustn't)be things people use
用should,shouldn’t,must,mustn’t,needn’t,can’t ,may,have to 填空
初二英语作业本 用should,shouldn't,can,must或mustn't完成句子.
Ought,ought't to,should,shouldn't Mustn't,
People usually use s_ to show what you must and mustn't do
We mustn't use the things ____(pollute) the environment.
用must,must not ,should ,shouldn‘t填空
Some things shouldn\'t be destroyed什么意思
must/should/shouldn't/needn't/could/couldn't/may/mought+have
can,can't,must,mustn't,needn't,be allowed to,have to,don't h
存在can be/must be ,can’t be 而没有mustn't be
添must或mustn't.