Giải giúp mình với ạ gấp lắm rồi

$1. (-)$ I haven't finished my homework.

$(?)$ Have you finished your homework?

→ Công thức thì hiện tại hoàn thành:

$(+) S + have/has + VPII/ed + O$

$(-) S + have/ has + not + O$

$(?) Have/ Has (not) + S + O?$

$2.$ $(+)$ My uncle has been to Singapore before.

$(?)$ Has your uncle been to Singapore before?

$3.$ $(+)$ They have found their keys.

$(-)$ They haven't found their keys.

→ Ta dùng thì HTHT để loan báo một tin tức/ sự việc vừa mới xảy ra

$4.$ $(-)$ Jim hasn't just played the video games with his brother.

$(?)$ Has Jim just played the video games with his brother?

$5.$ $(+)$ My grandmother has visited me since November.

$(?)$ Has your grandmother visited me since November?

$6.$ $(+)$ Your sister has studied Medicine for 2 years.

$(-)$ Your sister hasn't studied Medicine for 2 years.

$7.$ $(-)$ It hasn't been long since our last encounter,

$(?)$ Has it been long since our last encounter?