I forgot my book at the library.
Meaning: This means you left your book in the library when you were there.
Choice of Words: Forgot means to lose remembrance of something. Book is a written or printed work consisting of pages glued together. At means in a particular place or position. Library is a place where books and other materials are kept for reading and borrowing. The sentence states that the speaker left their book unintentionally at the library.
Alternative Expressions
Related Expressions