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Questions & Answers about Dlaczego jesteś smutny?
How would I answer this question using the new word bo (because)?
You would reply by saying something like Bo jestem... (Because I am...). The question word dlaczego (why) and the conjunction bo (because) naturally go together as a pair to ask and answer questions!
Why doesn't the sentence say Dlaczego ty jesteś smutny?
In Polish, the verb itself tells you who is doing the action. Since jesteś specifically means "you are", adding the pronoun ty (you) is unnecessary unless you really want to emphasize it, as in "Why are you sad?"
The word for sad here is smutny. Does this change if I'm talking to a woman?
Yes! Adjectives in Polish must match the gender of the person they describe. Since smutny ends in -y, it is the masculine form. If you are asking a woman, you would change the ending to the feminine -a, making it Dlaczego jesteś smutna?