Learn Polish: Najpierw niech kierownik sprawdzi dokument, a potem niech wyśle maila. - First let the manager check the document, and then let him send an email.

The word niech translates to "let" for third-person commands (let him, let her, let them). You simply place niech before the 3rd-person verb. In this sentence, we use it twice: niech sprawdzi (let him check) and niech wyśle (let him send).

Are sprawdzi and wyśle in the present tense?

They use present tense conjugation endings, but they are perfective verbs (verbs that describe a completed action). For perfective verbs, this form actually has a future meaning. After niech, using a perfective verb means you want the person to completely finish the action.

Why is the word for email written as maila instead of just mail?

The verb wyśle (will send) needs a direct object, which takes the accusative case. Even though an email is an inanimate object, everyday Polish often treats modern technology words (like smartphone, SMS, or mail) as animate masculine nouns. This means it takes the -a ending, just like an animal or person would.

Why does the sentence use a potem instead of i potem for "and then"?

While i simply connects two things, a is often used to show a transition, a contrast, or a sequence of different actions. The phrase a potem is a very common combination meaning "and then," which smoothly moves the sentence from the first task to the second.