I'm sorry I can't wait for you. Imust attend a meeting in an hour.

对不起，我要走了(能等)一小时候我要去开会。

youdao

I'm sorry I can't come to the party because I have to attend a meeting.

抱歉我不能参加这个聚会，因为我的参加一个会议。

youdao

I'm sorry, I can't attend your birthday party tomorrow.

我明天不能参加你的生日聚会了。

youdao