I know you are very busy with schoolwork, but remember that you promised to write me at least once a week.

我知道你功课非常忙碌，但是你要记得曾答应过每星期至少要写一封信给我。

youdao

I know you are very busy with schoolwork, but remember that you promised to write me at least once a week.

我知道你功课非常忙碌，但是你要记得曾答应过每星期至少要写一封信给我。

youdao