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WHICH is an interrogative pronoun while being conjunction also it can be a noun clause

So WHICH can be subject, object, complement & object of the preposition

You may choose which books you like best.( here WHICH is object )

Why do you ask questions to which you already know the answers? (here WHICH is object of the preposition)

And it is hard to find WHICH rolling as subject & complement.

So I made it please check my sentence it correct or not

Which is your girl friend in this picture is very confused.

S V ad a

which is mine is unknown.

S V C
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Grammar GO
WHICH is an interrogative pronoun while being conjunction also it can be a noun clause

So WHICH can be subject, object, complement & object of the preposition

You may choose which books you like best.( here WHICH is object )

Which is an adjective modifying the object books.

Why do you ask questions to which you already know the answers? (here WHICH is object of the preposition)

And it is hard to find WHICH rolling as subject & complement.

So I made it please check my sentence it correct or not

Which is your girl friend in this picture is very confused. confusing

S V ad a

which is mine is unknown.

S V C

I think that's about it.

By the way, welcome to the Forums!

Comments  
Thank you for help

Which is your girl friend in this picture is very confused. confusing

S V ad a

which is mine is unknown.

S V C

So are both of them correct??