"The plane cannot take off."

Translation: 飞机不可以起飞。

[Brooks730166]

飞机不能起飞 should also be accepted.

[uncannyrain]

Agree, I wrote that too. No difference in meaning here.

[GanXingba]

It depends on why the plane couldnt take off. If something was wrong with it and it could not fly, use 不能，but if say permission by air traffic control was not granted for the plane to take off, then its not allowed so use 不可以. But this sentence gave no context.

[baznur]

不可以 Actually means "not allowed". If it was supposed to mean "can't" then should be 不能

[stupedfatidiot]

Then whats the point of this plane?

[KevinAbel13]

The plane cannot take off

[Carmen_Yomisma]

I think this question needs some context if they are going to accept only 不可以and not 不能 or 不会 . Otherwise there is no learning the difference between them, or just why the exercise failed.