napisałem

In a sentence

• Napisałem list do mojego przyjaciela.

  I wrote a letter to my friend.

  The word 'napisałem' means 'I wrote' and is used in the past tense, first person singular, to indicate that the speaker has completed the action of writing.

• Wczoraj napisałem artykuł na bloga.

  Yesterday I wrote an article for the blog.

  'Napisałem' in this sentence indicates a completed action in the past, specifically yesterday, showing the speaker's action of writing.

• Nie wiedziałem, że już napisałem tę wiadomość.

  I didn't know that I had already written this message.

  Here, 'napisałem' is used in a past-tense statement to express that the speaker has already completed the action of writing the message before the current moment in time.