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I wanted to say "I think the primary use case for USB A were thumbdrives" but I am utterly unsure whether it's "was" because the primary use case or it's "were" because thumbdrives.

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    The subject and verb should match for number. The subject is the singular NP "the primary use case for USB A", thus singular "was" is correct.
    – BillJ
    Commented Oct 19, 2021 at 6:47
  • What @BillJ said. In contexts where a singular subject is being "equated" with a plural noun phrase, or vice-versa, the actual verb form agrees with the syntactic subject, whichever way round it goes. So The primary use case for USB A was thumbdrives, OR Thumbdrives were the primary use case for USB A. Commented Oct 19, 2021 at 11:45
  • Grammar aside, don't say this. It's factually incorrect. USB A predates thumb drives.
    – relaxing
    Commented Oct 19, 2021 at 14:04

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"I think the primary use case for USB A was thumb drives."

"Use case" is the subject of the verb, and it's singular, so "was" is correct.

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