Viết lại câu : He is the worst student in his class.

-> No one in his class is worse than he

1/ I/to/your/need/height/know

-> I need to know your height.

2/ you/stay/in/ had/now/better/bed

-> You had better stay in your bed now

3/ were/why/absent/from/youclass/yesterday?

-> Why were you absent from class yesterday?