To say something will happen "in" a certain amount of time, use через followed by a time word in the Accusative case:
- Masculine (inanimate): Nouns like час (hour) and месяц (month) do not change.
- Feminine: Nouns change -а to -у (минута → минуту) and -я to -ю (неделя → неделю).
| The pain is very bad. The dentist will extract the tooth in an hour. | Боль очень сильная. Стоматолог удалит зуб через час. |
| The doctor will look at your x-ray in a minute. | Врач посмотрит ваш снимок через минуту. |
| My brother must go to the dentist in a week. | Мой брат должен пойти к стоматологу через неделю. |
Appointments and Treatments
When making an appointment (записаться) for a specific purpose—like a check-up (осмотр)—use the preposition на followed by the Accusative case (e.g., на осмотр).
| He needs to make an appointment for a check-up in a month. | Ему надо записаться на осмотр через месяц. |
| In a week the dentist will look at the filling. | Через неделю стоматолог посмотрит пломбу. |
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