Put the correct form of the sentences

1. (+) I have finished my homework 
    (-) _______________________
    (?) ______________________ ? 

2. (+) _____________________ 
    (-)  My uncle hans't been to Singapore before 
    (?) ______________________ ?

3. (+) ______________________ 
    (-) ______________________
    (?) Have they found their keys ?

4. (+) Jim has just played video games with his brother 
    (-) _______________________ 
    (?) ______________________ ?

5. (+) ______________________
    (-) My grandmother hasn't visited me since November .
    (?) _______________________ ?

6. (+) _________________
    (-) _________________
    (?) Has your sister studied Medicine for 2 years?

7. (+) It has bên long since our last encounter 
    (-) __________________ 
    (?) _________________ ?

8. (+) __________________
    (-) We haven's graduated yet 
    (?) __________________ ?

MỌI NG GIÚP MIK VS !