"Im" and "am" are contractions of the prepositions in/an and the article "dem" for the masculine Dative case.
im
“Im” is a merger of “in” + “dem”
which means that it uses the Dativ case.
Germans use “im” if they would like to express “inside of.” In terms of fixes prepositions, you use “im” in German to talk about the year’s seasons or the months.
im as a contraction of in dem
in dem Haus ist Licht > Im Haus ist Licht - There is light in the house.
im in the meaning of during or at a course of action
Die Konferenz ist im Gang(e). The conference is in progress.
am
Like “im”, also “am” is a merger of “an” + “dem”
In German, you will always have to use “am” if you refer to a specific day, times of the day, or date.
in
So if you are talking about a motion or a change of places, you should use Accusative and in this case you use "in + den/die/das/die" (in + das merge to ins, special usage). This case is mostly used with "into" in English.
I'm walking into the class — Ich gehe in die Klasse. Accusative, Feminine
If you are talking about a location, you should use Dative and in this case you use "in + dem/der/dem/den" (in + dem merge to im, special usage).
in the cage — im Käfig (in + dem Käfig) Dative, Masculine.
Er hat seine Hausaufgaben gemacht. Dann ist er ins (in das) Bett gegangen

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