Learn Russian: Моя сестра берёт мою расчёску каждый день!

In Russian, to state how often something happens (like 'every day' or 'every week'), you use the Accusative case without any prepositions. Because день (day) is a masculine inanimate noun, its Accusative form looks exactly the same as its Nominative (dictionary) form, so we get каждый день.

Why does the sentence say мою расчёску instead of моя расчёска?

The comb is the direct object of the sentence because it is the thing being taken. Therefore, both the feminine noun расчёска (comb) and the possessive pronoun моя (my) must change to the Accusative case, becoming мою расчёску.

I know the dictionary form of the verb is брать (to take). Why does it change to берёт?

The verb брать has an irregular spelling shift when conjugated. An -е- is added into the root, so it becomes берёт for 'she takes' instead of following the regular rules. The pattern goes: я беру, ты берёшь, он/она/оно берёт, and so on.

Can I put каждый день at the beginning of the sentence instead of the end?

Yes! Word order in Russian is quite flexible. You can absolutely say Каждый день моя сестра берёт мою расчёску! Putting the time phrase at the end adds a bit of frustration or emphasis to the action, while putting it at the beginning simply sets the timeframe right away.