Because I 'm doing my homework.

因为我正在做作业。

youdao

I wasn't doing my homework at 9 o 'clock p. m. last Sunday.

上个星期天晚上九点我不在做家庭作业。

youdao

I was doing my homework at 9 o 'clock p. m. last Sunday.

上个星期天晚上九点我正在做家庭作业。

youdao

I was doing my homework at 9 o 'clock p. m. last Sunday.

上个星期天晚上九点我正在做家庭作业。

youdao