1.(-)I have not finished my homework.
(?)Have you finished my homework?
2.(+)My uncle has been to Singapore before.
(?)Has your uncle been to Singapore before?
3.(+)They have found their keys.
(-)They have not found their keys.
4.(-)Jim has not just played video games with his brother.
(?)Has Jim just played video games with his brother?
5.(+)My grandmother has visited me since May.
(?)Has your grandmother visited you since May?
