三年级下册英语第三单元的几个句子的读法如下:
1. "Is this a library book?" —— 读法:This a library book?
3. "Is this your pencil?" —— 读法:This your pencil?
4. "Yes, it is. Thank you." ——读法:Yes, it is. Thank you.
6. "It's a library book." —— 读法:It's a library book.
7. "Do you like books?" —— 读法:You like books?
8. "Yes, I do. I like library books." —— 读法:Yes, I do. I like library books.