Question

unless you wear a formal suit _ (conditional - use the right form of the verb and complete the sentence)​

Answer 1

Answer:

You won't be allowed to attend the party, unless you wear a formal suit.

Explanation:

According to Oxford Dictionary unless is used to talk about a situation that could happen, or something that could be true, in the future. If you know that something has not happened or that something is not true, ‘if…not’ is used.

Answer 2

Answer:

You won't be allowed to attend the party unless you wear formal suit.

I hope it helps you