1 Ba doesn't learn harder than Nam ( Câu so sánh hơn)
2 Hoa asked Nga what kind of book she liked reading best ( Câu hỏi trong lới nói gián tiếp)
3 Mary was wearing the red dress which was made in France (Mệnh đề quan hệ)
4 This is the first time I've seen that film (Cấu trúc viết lại câu ở thì HTHT)