Kayo, you (plural), is used instead of ikaw/ka, you (singular), to address older people, superiors, adult strangers and adult customers.
Sila, they, is also often used to address customers and high-ranking officials. It is also used when asking an adult stranger who he or she is. Example:
Sino po’ sila?
May I have your name, please?
May I know who you are?
Lit. Who are they?
See also: po’/ho’ 1 (p. 325)
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