I have to go to Beijing for business on that day so I'm afraid I couldn't attend your party.

我那天要去北京出差，所以恐怕我去不了你们的聚会了。

youdao

I have to go to Beijing for business on that day so I'm afraid I couldn't attend your party.

我那天要去北京出差，所以恐怕我去不了你们的聚会了。

youdao