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Prepositional Vs. Accusative case

When you talk about where (the place of where a person or a thing is) use Prepositional case.
When you talk about where to (the direction) use Accusative case.

Use P.c. or A.c. Examples
Где? Where? + Prepositional case (P.c.) = place Я живу в Москве(P.c.).
I live in Moscow.
Я учусь в школе(P.c.).
I study at school.
Куда? Where to? + Accusative case (A.c.) = the direction Я лечу в Москву(A.c.).
I fly to Moscow.
Я иду в школу(A.c.).
I go to school.

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