gạch chân.Câu nào là mệnh đề ko xác định và câu nào là mệnh đề xác định 1. i told you about the woman who lives next door 2. ba whom i met yesterday is reading books 3. i was invited by the professor whom i met at the meeting 4. they are building the house which is next to my office 5. they are building the house which i visited yesterday 6. ba whose mother is my teacher is reading books 7. kangaroos which come from australia have long tails 8.Ba who lives on trang tien street likes playing the guitar 9. the novel that you gave me on my birthday has been lost 10. neil armstrong ,who first walked on the moon lived in the usa 11. the chair that i bought yesterday is broken 12. miss lien, who sings very well is my english teacher 13. viet nam, which is in south-east asia exports rice