Pamiętaj, że on jest dzisiaj bardzo zmęczony.

From Lesson 71:The imperative mood·Polish

Breakdown of Pamiętaj, że on jest dzisiaj bardzo zmęczony.

być
to be
on
he / it (m)
bardzo
very
dzisiaj
today
zmęczony
tired
że
that
pamiętać
to remember

Questions & Answers about Pamiętaj, że on jest dzisiaj bardzo zmęczony.

How do we get the command Pamiętaj from the verb pamiętać?
Pamiętaj is the informal singular command (telling one person "Remember!"). For many verbs ending in -ać, like pamiętać (to remember) or czytać (to read), you form this command by dropping the and adding -j. So, pamiętać simply becomes pamiętaj.
Is the comma before że strictly necessary?
Yes! In Polish, you must always place a comma before the word że (that) when it connects two parts of a sentence. It is a very strict punctuation rule that you will see everywhere.
Why does the word for tired (zmęczony) end in -y here?
Because it describes on (he). In Polish, adjectives must match the gender of the person or thing they describe. Zmęczony is the masculine form. If you were telling someone to remember that she is tired, you would use the feminine form: Pamiętaj, że ona jest dzisiaj bardzo zmęczona.
Could I put dzisiaj (today) at the very end of the sentence instead?
Yes, you absolutely could. Polish word order is flexible, so ...że on jest bardzo zmęczony dzisiaj is grammatically correct. However, placing a time word like dzisiaj right after the verb (jest) is a very natural and common way to build sentences in Polish.

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