1. Nam is Hoa's brother.
-> Hoa is Nam's sister.
2. What a awful restaurant !
-> How awful the restaurant is !
3. This ruler is the cheapest.
-> There is no cheaper ruler than this one.
-> No one ruler is cheaper than this one
4. She is well studies.
Câu 2 là dấu chấm tha , dấu chấm hỏi là sai
-> She is study well