chuyển các câu sau thành câu hỏi và câu phủ định
1 that student studies hard every day
2 Mr brown goes to his office every day
3 I want cream and sugar
4 the children go to bed very early
5 that gril comes from the USA
6 thereis a flower vase on the table
7 lan wears uniform on weekdays
8 there are some students in the library