Pero el teclado todavía no ha funcionado.

Questions & Answers about Pero el teclado todavía no ha funcionado.

Why do we use ha here instead of another form like he or han?
ha is the form of the helping verb haber used for "he", "she", or "it". In this sentence, the subject doing the action is el teclado (the keyboard). Since a keyboard is an "it", we use the "it" form: ha.
How do we get the word funcionado?
It is the past participle of the verb funcionar (to work / to function). For regular verbs ending in -ar, you drop the -ar and add -ado to form the participle. Together with ha, it makes ha funcionado (has worked).
Could I use trabajado instead of funcionado for "worked"?
No, because Spanish uses two different words for "to work". Trabajar is used when a person or animal does a job or physical labor. When talking about a machine, electronic device, or system working properly (like a keyboard), you must use funcionar.
Why does no go between todavía and ha funcionado?
In Spanish, the negative word no must always go right before the verb. In this tense, the helping verb ha and the participle funcionado act as a single unit that cannot be separated, so no goes immediately before ha. The word todavía (still/yet) often goes right before the no to mean "not yet".

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