What is a relative clause?
A Relative clause is a kind of a subordinate clause which functions as a post modifier to the head word within a phrase.
I work for the agency which is based in Delhi.
The clause 'which is based in Delhi' describes the location of the agency thus performing the function of a a post modifier to the head word i.e. the agency.
The selected the girl who spoke confidently during the interview.
The customer who rushed into the shop was panting.
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