I have to be in bed before 10 o'clock.
They can't listen to music when they are in school at night.
This girl must practise playing piano everyday.
He can't meet his friends after school.
楼上不准
这几句用英语怎么写（1）10点前我必须躺在床上的英语怎么写（2）他们在上学的晚上不能听音乐.（3）这个女孩每天必须练习钢