In

QuestionAnswer
in
in
a, an
ein
in a company
in einer Firma
He works in a company.
Er arbeitet in einer Firma.
in the company
in der Firma
in a house
in einem Haus
in the (masculine, neuter)
in dem - im

most of the time in dem is contracted to im

except when you insist on the determined article, that is you are pointing to the object, distinguishing it from similar ones

in the house
im Haus
in the coffee
im Kaffee
He is in the car.
Er ist im Auto.
I am inside the house.
Ich bin im Haus.
The woman works in the company.
Die Frau arbeitet in der Firma.
The computer is in the car.
Der Komputer ist im Auto.

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