Question

When you listen to the teacher you should be careful同义句是什么

Answer 1

When you listen to the teacher you should be careful。同义句：
1) You should be careful when you listen to the teacher.
2) You should be careful while (you are) listening to the teacher.

这是when引导的时间状语从句，可置于句首也可置于句尾，可互换；如果是一个更复杂的句子，
也可置于句中，称其为插入。这个句子表示一个动作和另一个动作同时发生，自然可由while转换。希望能帮到楼主，欢迎追问！望采纳。加油！

Answer 2

you should be careful when you listen to the teacher.

Answer 3

Be careful when you listen to the teacher