Question

This is right?

Answer 1

Answer:

No, I am afraid it is not.

Explanation:

1) this sentences is theoretically correct but I think you can better use as sujet et verbe; il faut.

I do not know if this is not what you had in mind but then it would be something like;

Avant qu'on visite à quelqu'un, il faut acheter un cadeau.

2) you forgot to conjugate the verb avoir.

Si le sujet serait ils, le verbe se devrait adapter au sujet.

So better would be; Après qu'ils ont mangé, ils disaient merci

Answer 2

Oui bravo remember to use capital letters :)