Questions & Answers about Перед отправкой нужно поставить галочку в этом поле.
Why is it перед отправкой, not перед отправка or перед отправку?
Because перед here means before in a time sense, and with that meaning it normally takes the instrumental case.
- отправка = sending, submission
- instrumental singular: отправкой
So перед отправкой literally means before the sending / before submission.
This is a very common pattern:
- перед уроком = before the lesson
- перед встречей = before the meeting
- перед отъездом = before leaving
What exactly is нужно here?
Нужно is an impersonal word meaning it is necessary, one must, or you need to, depending on context.
In this sentence, there is no explicit subject like you. Russian often leaves that unstated when the meaning is general or obvious from context.
So:
- нужно поставить галочку = it is necessary to tick/check the box
- more naturally in English: you need to tick the box
Why is the verb поставить and not ставить?