Breakdown of El mesero sirve estas ensaladas.
la ensalada
salad
el mesero
the waiter
servir
to serve / to work / be suitable
estas
these (feminine)
Questions & Answers about El mesero sirve estas ensaladas.
Why is it estas here instead of estos?
Wait, doesn't estás mean "you are"? Why does it mean "these" here?
Notice the spelling! Estás (with an accent mark on the 'a') is the verb meaning "you are". Estas (no accent mark) is the adjective meaning "these". Paying attention to written accents is very important in Spanish to tell these two common words apart.
I learned the verb to serve is servir. Why is it spelled sirve here instead of "serve"?
Servir is what's called a stem-changing verb. When you conjugate it for he/she/it (in this case, el mesero), the e in the stem changes to an i. That's why it becomes sirve.