"I can't attend the art class tomorrow."

Translation: 我明天不能上美术课。

[LazyFailure]

I this case, I think 我明天不能参加美术课 works too, if a bit awkward.

[RobinThor]

what about 可以 instead of 能?

[Zukus]

Yes 可以 is correct

[ktdilsiz]

我明天不能参加美术课？ would this be okay? Could someone native or fluent confirm?

[Zukus]

參加 is more like participate than attend

[wxf163c]

可以这么说，没问题。

[bmjym98]

should be 我明天不能参加艺术课

[crazyowlai]

I think “了” is missing at the end of this sentence. should be "我明天不能上美术课了。"

[wxf163c]

都对。