Question

Do this or you will be punished. Convert into complex sentence

Answer 1

if you will not do this you will be punished

I hope it helps you!!!
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Answer 2

If you do not do this you might be punished.

This is the complex sentence of the above given simple statement.

A simple sentence can be altered to form a complex sentence.

Any phrase or word in a particular sentence needs to be expanded to form a complex sentence.

The complex sentence can be an adverb clause, noun clause or an adjective clause.