真可惜我不能参加这次会议。

Unfortunately, I won't be able to attend the meeting.

《牛津词典》

我从上周开始就感觉不适，所以很抱歉我不能参加你的聚会。

I've been feeling ill since last week, so I am sorry that I can't go to your party.

youdao

我没有及时报名，因此我不能参加比赛。

I didn’t sign up in time, so I’m not registered.

youdao

I don't think I can get either Icahn--both Icahn and Schwarzman are coming to give a lecture in April, but I don't think either of them will stay for lunch, so this is only a lunch in the event.

我想伊坎不能一起参加了,四月份的客座教授是伊坎和施瓦茨曼,但我想他们都不会都留下来吃午饭,所以这是唯一一次和嘉宾共进午餐

耶鲁公开课 - 金融市场课程节选

But I was, I wasn't able to join this semester

但是我，呃，我这个学期不能参加。

乐团怎么样？ - SpeakingMax英语口语达人

I don't know if I can come to your party.

我不知道我能不能参加你的派对。

I don't know 实战 - SpeakingMax英语口语达人