Ellas están nerviosas porque el tren llega ahora.

Questions & Answers about Ellas están nerviosas porque el tren llega ahora.

Why do we use están instead of son here?
We use están (from the verb estar) because feeling nervous is a temporary emotion or state. If you used son (from the verb ser), it would mean they are nervous people in general, as a permanent personality trait.
Why does nerviosas end with -as?
Adjectives in Spanish must match the people or things they describe. Since Ellas refers to a group of females (which is feminine and plural), the base dictionary word nervioso changes its ending to nerviosas to match.
Why is porque written as one word here?
When written as a single word without an accent mark, porque means because. If it is written as two words with an accent mark (por qué), it becomes a question word meaning why.
Why do we use the simple present llega if the train is arriving right now?
In Spanish, the simple present tense like llega is frequently used for actions happening right at this exact moment or in the immediate future. It is completely natural to use it for scheduled events like a train arriving.

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