Ein kurzer Regenschauer überrascht uns auf dem Weg zum Markt.

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Questions & Answers about Ein kurzer Regenschauer überrascht uns auf dem Weg zum Markt.

Why is it Ein kurzer Regenschauer and not Eines kurzen Regenschauers?

Because Ein kurzer Regenschauer is the subject of the sentence in the nominative case. The masculine noun Regenschauer takes ein (nominative singular). After ein, the adjective kurz gets the ending -er (weak declension) → kurzer.
If you wanted the genitive (e.g. “of a short shower”), you’d use eines kurzen Regenschauers, but here it’s clearly the subject doing the action (nominative).

How is the compound noun Regenschauer formed and why is it masculine?
Regenschauer is a compound of Regen (rain, m.) + Schauer (shower, m.). In German compounds, the gender is determined by the last element (“Schauer”), which is masculine. You write them together without a space: Regenschauer.
Is überrascht a participle or the present‐tense verb form? How can I tell?
Here it’s the 3rd person singular present of the verb überraschen (to surprise): er/sie/es überrascht. Clues: it stands in 2nd position (normal finite‐verb position in a main clause) and goes with a nominative subject (Ein kurzer Regenschauer). The past participle überrascht would need an auxiliary (e.g. “ist überrascht worden”).
Which case is uns, and why isn’t it wir?
uns is the first‐person‐plural accusative pronoun (and looks the same in dative). Since überraschen takes a direct object (jemanden überraschen = “to surprise someone”), the entity being surprised is in the accusative → uns. Wir would be nominative (we do something), but here “we” are receiving the surprise.
Why is it auf dem Weg and not auf den Weg?
auf is a Wechselpräposition (“two‐way preposition”). When it describes location (where something happens → “on the way”), it takes the dative case: dem Weg (masculine). If you expressed motion toward something (onto the path), you’d use accusative (auf den Weg).
What does zum Markt mean, and why is it zum?
zum is the contraction of zu dem (“to the”). zu also governs the dative when indicating direction, so dem Markt (dative masculine) plus zu becomes zum Markt (= “to/towards the market”).
Why isn’t there a comma before auf dem Weg zum Markt?
German commas are required for subordinate clauses or certain infinitive/participial constructions, but not for simple adverbial phrases. Auf dem Weg zum Markt is just a prepositional adverbial (telling us where), so no comma is needed.