Problem of modifier

[peteryoung]

Thanks for viewing. Here's my question:

What is which representing in the sentence below?

English has a beauty of its own and forms of expression which are duplicated nowhere else.


Is it 'expression', 'forms', or 'beauty and forms'?

Is this sentence correct?
I have a apple and a banana which were bought yesterday.


Thanks!

[Casiopea]

[1] . . . forms of expression which are duplicated nowhere else.

[2] I have an apple and a banana, which were (both) bought yesterday.

[3] I have an apple and a banana, both of which were bought yesterday.

[peteryoung]

A million Thanks!