I am confused about this sentence: do I use do or does?

Will it depend on what the subject is? Which is the correct one?

  1. What do your best friend's parents do?
  2. What does your best friend's parents do?

What is the subject here?

  • "Parents" is the subject. "Parents" is plural. Therefore, by the English Law of Conservation of S Characters, it would be "do".
    – Hot Licks
    Jul 4 '19 at 22:35
  • Did you mean the target Which asked for is parents ( plural "they"), so the correct answer with auxiliary do.
    – Mohamed Ejbali
    Jul 4 '19 at 22:51
  • Parentsdo; parentdoes. Jul 4 '19 at 23:49

The subject is "your best friend's parents".
This is plural ("parents"), so 1 is correct.

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