Learn Finnish: Minun piti käydä maistamassa uuden ruokarekan katuruokaa. - I had to go try the street food at the new food truck.

The verb käydä (to visit / to go do something) requires the next verb to be in the 3rd infinitive inessive form (-massa or -mässä). This structure translates to making a trip to perform an action, so käydä maistamassa means to go and taste.

Sentences expressing necessity like Minun piti usually take a nominative object instead of a genitive one. Why is katuruokaa partitive here?

While it is true that necessive sentences drop the genitive -n for total objects, the partitive case always overrides this rule. The verb maistaa (to taste) naturally takes a partitive object because you are tasting a portion or an undefined amount, so katuruokaa remains in the partitive case.

Why is the subject translated as the genitive Minun instead of Minä?

This sentence uses a necessive structure to express obligation (I had to). In Finnish, necessive structures require the subject to be in the genitive case (Minun) and the main verb (pitää) to be locked in the third-person singular (piti).

How is the word ruokarekan formed and why is it in the genitive case?