我分不清美国口音和加拿大口音的区别。

I can't ___tell ___the ___difference between an American and a Canadian accent.

不仅他们的批判感会萎缩，而且他们将无法区分对错。

Not only will their critical sense atrophy but also they will not be able to ___tell ___the ___difference between what is right and wrong.

很难分辨原作和赝品的区别。

It's hard to ___tell ___the ___difference between the original painting and the forgery.