Questions & Answers about No duermo bien por esa multa.
Why do we use por here instead of para or porque?
Why is the word for "that" spelled esa instead of ese or eso?
Esa is an adjective that must match the gender of the noun it points to. Since multa (fine) is a feminine noun, we use the feminine form esa. You use ese for masculine nouns, and eso only when pointing to an abstract idea, a situation, or an unknown object.
The infinitive is dormir. Why does the "o" change to "ue" in duermo?
Dormir (to sleep) is a stem-changing verb. In the present tense, the o changes to ue for most subject pronouns, giving us forms like yo duermo (I sleep) and tú duermes (you sleep). The o only stays the same for the nosotros form (dormimos).
Could I say por causa de esa multa instead of just por esa multa?