But from a few feet away you couldn't tell the difference.

Even after a day or two, I could tell the difference.

But how does one tell the difference between good and bad?

Hard to tell the difference and you don't wait to find out.

Was he able to tell the difference between right and wrong?

But how do you tell the difference between the two?

He had lived here long enough to tell the difference.

Test your knowledge and see if you can tell the difference.

"People will not be able to tell the difference between your plan and the other guy's."

His plan works, as no one can tell the difference between them.