Я бегаю по парку утром.

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Breakdown of Я бегаю по парку утром.

• бегать: to run
• парк: the park
• утром: in the morning

Questions & Answers about Я бегаю по парку утром.

Why is it бегаю and not бегу?

Бегаю is from бегать (multi-directional, imperfective) and is used for habits/repeated actions or running around within an area. Бегу is from бежать (uni-directional) and is used for motion in one direction, often “I am running (now).” For a routine: Я бегаю…; for right now: Я бегу….

What does по mean here, and which case does it take?

Here по means “around/throughout/along (within a space).” With this meaning it takes the Dative case, so парк becomes парку: по парку = “around/through the park (inside it).”

Can I say в парке instead of по парку?

Yes, but there’s a nuance. В парке (Prepositional) states location “in the park” neutrally. По парку (Dative) highlights movement within the area, “around/throughout the park.” Both are fine with running; по парку sounds more dynamic.

Why is it парку and not парке?

Because по + area/movement uses the Dative: по парку. The form в парке uses the Prepositional after в to mark location. Singular of парк: Nom парк, Gen парка, Dat парку, Acc парк, Instr парком, Prep (о) парке.