This is the same book that I lost last year.
This is the book which/that I lost last year.
What is the difference b/w these sentences. Book says we can't use "which" in case of 1 sentence. why so?
This is the same book that I lost last year.
This is the book which/that I lost last year.
What is the difference b/w these sentences. Book says we can't use "which" in case of 1 sentence. why so?