They have lived in a city which is very crowded.
What is a relative clause?
A relative clause exists as one type of dependent clause. It contains a subject and verb, but can't stand alone as a sentence. It exists sometimes called an “adjective clause” because it operates like an adjective—it provides more details about a noun.
A relative clause exists as a clause that modifies a noun or noun phrase and utilizes some grammatical device to demonstrate that one of the statements in the relative clause guides to the noun or noun phrase.
Defining relative clauses exist composed of a relative pronoun (sometimes omitted), a verb, and optionally other components such as the subject or object of the verb. Commas are not utilized to separate determining relative clauses from the rest of the sentence.
Hence, They have lived in a city which is very crowded.
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