Viết các câu sau ở thể khẳng định (+), thể phủ định (-)

Viết các câu sau ở thể khẳng định (+), thể phủ định (-), thể nghi vấn (?) ở thì hiện tại hoàn thành.

1.         (+) I have finished my homework.

(-) ________________________________________________________________.

(?) ________________________________________________________________?

2.         (+) ________________________________________________________________.

(-) My uncle hasn’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 been long since our last encounter.

(-) ________________________________________________________________.

(?) ________________________________________________________________?

8. (+) ________________________________________________________________.

(-) We haven’t graduated yet.

(?) ________________________________________________________________?