English Practice Test

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Which of these sentences is properly punctuated?

Yes Jack you were right about that answer.
Yes Jack, you were right, about that answer.
Yes Jack, you were right about that answer.
Yes, Jack, you were right about that answer.

Fact Lab

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Interesting fact:

Did you know that there was a precise account in medieval Europe for how long a “moment” actually was? It was precisely 1/40th of an hour or 90 seconds. This seems unnecessarily specific, but alright.