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He walked back and forth in the room, thinkingabout the problem.

他在屋里来回走动，思考着问题。

Don't say this back and forth, I know how to do.
不要反复说这个，我知道该怎么做。

A: Please don't go back and forth, I'm doing my homework.
请不要来回走动，我在写作业。

B:Oh, I'm sorry, I didn't notice that you were doing yourhomework.
哦，对不起，我没注意到你在写作业。