Find the underlined part that needs correction in each of the following questions

IV.Find the underlined part that needs correction in each of the following questions.
13. I can't find my pen anywhere. Can I borrow yours pen?
14. Yellow Flowers on the Green Grass is an exciting novel for the author Nguyễn Nhật Ánh.
15. Do you think your friends likes reading that new book?
16. Geography is my favorite subject. I don’t like math, physics and chemistry.