No. 4,246 in German
deinem
"Deinem" means "your" (possessive, referring to a singular informal 'you' in the dative case).
In a sentence
Ich habe deinem Hund gestern das Spielzeug gegeben.
I gave your dog the toy yesterday.
'deinem' is the dative form of 'dein', signifying 'your' in relation to 'Hund', which requires dative due to the verb 'geben'.
Ich helfe deinem Bruder bei den Hausaufgaben.
I help your brother with the homework.
'deinem' is used here in the dative case because the verb 'helfen' requires the object (Bruder) to be in the dative case.
Kommst du morgen zu deinem Fest?
Are you coming to your party tomorrow?
'deinem' is in dative case due to the preposition 'zu', which requires a dative object ('Fest').
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