bonjour
2-
c'est simple, dès que tu as l'auxiliaire "did" tu mets la BV du verbe
c'est à dire aux formes interrogatives et négatives
A l'affirmatif, le verbe se met au prétérit
-bought
-buy
-visit
-visit
-visited et went
-go
4)
a) How are you ?
b) What did you do ?
c) Where did you go ?
d) Did you have a good time ?
5-
dad = Where did tou go exactly ?
dad = What kind of things did you buy ?
dad = Who did you meet ?
dad = What did he give you ?
voilà
bonne soirée :)