Question

If you do not work hard , you will fail (Rewrite the sentence using `unless' in place `if '
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Answer 1

Answer:

Unless you do not work hard, you will fail.

OR

You will fail unless you do not work hard.

Answer 2

Unless you work hard, you will fail.

• In the above sentence, "unless" is used as a  conjunction.
• "Unless" is called subordinating conjunction which is used at the beginning of a sentence.
• Conjunctions are usually used to combine two clauses or are used to modify the entire sentence into a simpler and more understandable form.
• Conjunctions are usually called "joining words". Examples of conjunctions are if, but, also, unless, etc.,