できる（できる）— can do; be able to
これ が できます か。
Can you do this?
できるできる
can do; be able to
できる
accent [2]In detail
Words
これkorethis
がga(marks what can be done)
できますdekimasucan do
かka(question marker)
できる expresses being able to do something. In this pattern, what you can do takes が. できます is the polite form.
Coco-sensei