帮忙看一下这个句子是否有语法错误？如果有请帮我改正并翻译一下，谢谢！

Question

While he was doing his homeworkat this time yesterday last night,I was doing that,too

Answer 1

太罗嗦了。供参考
While he was doing his homework this time last night, I was doing the same.

追问

必需要用at this time啊！

追答

谁说的。。。
this time就可以了。

追问

我们老师让用这个词组造句····

追答

这也太别扭了，at that time倒是比较常见。
你明天去问问老师，怎么看这个问题。
反正我是建议不要加at，如果你一定要加，就加吧。

追问

不是，我们老师让用at this time造过去进行时的句子···

追答

好吧，那你换一个说法。
He is doing his homework now. At this time, I am doing mine.
你要是用过去时，一般用at that time比较多。

Answer 2

没有明显的语法错误。
翻译：他昨晚做作业的时候，我也在做作业。

希望能够帮到你。

Answer 3

语法有点错误，应该是：While he was doing his homework at this time (yesterday/last night),I was doing that too.

Answer 4

while he was doing his homework at this time yesterday, i was also doing that .

追问

确定正确么？