Learn Polish: Adres nie jest wyraźny, proszę pisać wyraźnie. - The address is not clear, please write clearly.

To form an adverb from an adjective, Polish usually replaces the ending with -o or -e. For adjectives ending in -ny, the adverb ending is almost always -nie. Notice how the n softens into an ni sound to connect smoothly to the e.

Why is wyraźny in the nominative case? I thought we used the instrumental case after jest.

We use the instrumental case after być (to be) when we say a noun is another noun, like On jest nauczycielem (He is a teacher). But when we just use an adjective to describe the subject, like here, the adjective stays in the nominative case to match the subject (adres).

Why use proszę pisać instead of a direct command?

Using proszę (I ask / please) followed directly by an infinitive verb like pisać (to write) is the standard, polite way to tell someone to do something in Polish. It is much more common in everyday polite speech than using the strict imperative form of the verb.

Why is the imperfective verb pisać used here instead of the perfective napisać?

The imperfective verb pisać is used because it focuses on the ongoing process or habit of writing. The speaker is asking the person to change how they write in general, rather than asking them to complete one specific, finished piece of writing.