Question

use unless in place of if if you don't start you will be late

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Answer 1

Answer:

unless you start you will be late

Answer 2

Unless means the same as if...not. Like if, unless is followed by a present tense, a past tense, or a past perfect tense (never by a conditional). Unless is used instead of if...not in conditional sentences of all types. The order of the clauses doesn't matter with sentences using unless.