Questions & Answers about После ужина мы поедем домой на машине.
Because после requires the genitive case. The noun ужин changes to ужина in the genitive singular.
So:
- ужин = dinner
- после ужина = after dinner
This is a very common pattern:
- после работы = after work
- после урока = after the lesson
- после фильма = after the film
It is the genitive singular of ужин.
The base form is:
- ужин = dinner
After после, it becomes:
- после ужина = after dinner
For many masculine nouns, the genitive singular often ends in -а or -я.