1. I haven't finished my homework
Have i finished my homework?
2. My uncle has been to Singapore before
Has my uncle been to Singapore before?
3. They have found their keys
They haven't found their keys
4. Jim hasn't just played video games with his brother
Has Jim played video games with his brother?
5. My grandmother has visited me since november
Has my grandmother visited me since november?
Dài quá bạn ơi... đăng câu 6,7,8 lại đc k ạ