W niedzielę jemy obiad u mojej teściowej.
On Sunday we are eating dinner at my mother-in-law's place.
Breakdown of W niedzielę jemy obiad u mojej teściowej.
jeść
to eat
obiad
dinner / lunch (midday meal)
mój
my
w
in / on (a day)
Questions & Answers about W niedzielę jemy obiad u mojej teściowej.
Why do we say u mojej teściowej instead of u moja teściowa?
The preposition u (which means 'at someone's place') always requires the Genitive case. Because of this, the basic phrase moja teściowa changes to its Genitive form, mojej teściowej.
Wait, why does the noun teściowa end in -ej? Isn't that an adjective ending?
Why is Sunday written as w niedzielę? Doesn't the preposition w usually take the Locative case?
When talking about days of the week, the preposition w actually takes the Accusative case to mean 'on a specific day'. The basic word is niedziela, and its feminine Accusative form is niedzielę.
How does jemy work here if the dinner is happening on Sunday?
Just like in English ('we are eating dinner on Sunday'), you can use the present tense in Polish to talk about a fixed, planned event in the near future. The word jemy can mean 'we eat' or 'we are eating' depending on the context.