✍️GRAMAR

they have never visited U.S.A 

have you ever eaten colombian food 

have you toured quito yet?

Affirmative:

1.    They have sung karaoke many times

2.    marco has been on vacation on the beaches of U.S.A

Negative:

1.    She hasn't been to work this week

2.    Samuel and Saul haven’t bought new clothes this year

Interrogative:

1.    Hasn't the boy learned her lesson today?