Question

I know a poor man.(complex sentence)​

Answer 1

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I know a man who is poor.

Explanation ↴

We have to use an adjective clause to make it Complex sentence because an adjective clause (also called relative clause) is a dependent clause that modifies a noun or pronoun.

It tells which one or what kind. Adjective clauses almost always come right after the nouns they modify.

Example ↴

I lost this umbrella last week.

=> This is the umbrella which I lost last week.

Answer 2

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I know A men who is poor.

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