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Questions & Answers about El camarero sirve el vino.
Why is it sirve and not serve?
The verb servir (to serve) is a stem-changing verb. In the present tense, the e changes to an i for most forms, which is why it becomes sirve for he/she/it. The e stays the same in the 'we' form, giving us nosotros servimos.
Can I use mesero instead of camarero?
Do I really need the word el before camarero?
Yes. In Spanish, when a noun is the subject of the sentence (the person or thing doing the action), it almost always needs a definite article like el or la. Saying Camarero sirve el vino would sound incomplete and incorrect to a native speaker.