Learn Spanish (Spain): ¿Ya ha funcionado el tratamiento?

In Spanish, adverbs like ya (already) are very flexible, but they most commonly go right before the verb (ha funcionado). Remember that you can never put a word between the two parts of the pretérito perfecto (ha and funcionado), so placing ya at the very beginning is the most natural choice here.

Why use funcionado instead of trabajado for 'worked'?

Spanish has two different verbs for 'to work'. You use trabajar for a person doing physical or mental labor (a job). You use funcionar when talking about something functioning or being effective, like a machine, a plan, or in this case, a medical treatment (el tratamiento).

Why is the subject el tratamiento at the very end of the question?

In Spanish questions, it is perfectly normal to invert the word order and put the subject after the verb (ha funcionado). You could also say ¿El tratamiento ya ha funcionado?, but putting el tratamiento at the end sounds very natural to native speakers.

Why do we use the pretérito perfecto (ha funcionado) here?