Breakdown of Czy ona już przyjechała samochodem?
samochód
car
ona
she / it (f)
czy
[question particle]
już
already / anymore (with negation)
Questions & Answers about Czy ona już przyjechała samochodem?
Why use przyjechała instead of just jechała?
The prefix przy- adds the specific meaning of "arrival" to motion verbs. While jechała just means "she was driving" or "she was riding", przyjechała means "she arrived" (by vehicle). It also makes the verb perfective, meaning it focuses on the fact that the action was fully completed.
How does the verb przyjechała show us who is doing the action and when?
Why does the word for car change to samochodem?
When expressing how you travel (by car, by train, by bus), Polish uses the Instrumental case. The basic word samochód (car) takes the ending -em to become samochodem (by car). Notice that the ó changes to a regular o when we add the ending, and you don't need a Polish equivalent for the English word "by"!
Could I put już at the end of the sentence instead?
You could, because Polish word order is quite flexible. However, placing już (already) right before the verb (już przyjechała) is the most natural way to phrase it here, as it directly emphasizes the completion of her arrival.