句型转换（用两种形式改为同义句）
1.It is time for class. put your comic books away.
you___put your cimic books away.
you___ ___put your comic books awat.
2.your english is not good enough.read more to improve it.
you___read more to improve your english.
you___ ___read more to improve your english
3.keep your mobile phone off in class.
you___keep your mobile phone off in class.
you___ ___keep your mobile phone off in class.
4.do not make the same mistake again.
you___ ___make the same mistake again
you___ ___ ___make the same mistake again.
must.
have to
should
need to
3. should
had better
4. can not
had better not