UNLESS = iF … not

(a) I’ll go swimming tomorrow unless it’s cold.
(b) I’ll go swimming tomorrow if it isn’t cold.
Examples (a) and (b) have the same meaning.

FYI (For Your Information)

Restate each sentence with unless!

1. 1. If you don’t buy your ticket today, you won’t get one.
   -Unless you buy your ticket today, you won’t get one.
2. You can’t travel to that country if you don’t have a visa.
3. You can’t travel to that country if you don’t have a visa.
4. If you don’t sign up for the test by Monday, you can’t take it next month.
5. It’s difficult to return a product to that store if you don’t have a receipt.
6. You can’t get a motorcycle license if you haven’t passed a special training course.
7. The store won’t accept your credit card if you don’t have ID with you.
8. Traffic fines increase if you don’t pay them right away.

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