Question

This is the girl who talked to me yesterday ( identify clause)
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Answer 1

Answer:

who talked to me yesterday- Adjective clause

Answer 2

Answer:

Main clause- This is the girl.

Subordinate clause- who talked to me yesterday.- It is adjective clause.

The above given sentence has one main clause and one subordinate clause so it is a complex sentence.

This subordinate clause is an adjective clause because it is performing the role of adjective means it gives extra information about the subject in the main clause.