Questions & Answers about Дети быстро привыкают к школе.
Why do we need the preposition к here? Why not just say привыкают школе?
The verb привыкать (to get used to) always pairs with the preposition к (to/towards) plus the Dative case. In Russian, you cannot attach the Dative noun directly to this verb without к.
What case is школе in this sentence?
It is in the Dative case. The preposition к always requires the Dative case. For a feminine noun like школа, the ending changes from -а to -е.
Is привыкают an imperfective or perfective verb?
It is the imperfective verb привыкать. It is used here because getting used to something is an ongoing process, and the sentence describes a general fact. The perfective form for a completed action would be привыкнуть.
The word for child is ребёнок. Why is the plural дети so different?
The word ребёнок has an entirely irregular plural form. Instead of following the normal rules for plural endings, it changes the root of the word completely to дети (children).