Question

identify subordinate clause and name it:- a) He lost the book which i had given him.

Answer 1

he lost the book main clause
which I had given him subordinate adjective clause


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Answer 2

Here the main sentence is:

He lost the book which i had given him

In the above sentence,  

the principal clause is He lost the book  

the subordinate clause is

which I had given him.

This is because, the clause “which I had given him” is dependent on the principal clause.  

A subordinate clause describes the main clause or is dependent on it.