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I need to know if the verb form should be singular or plural in such sentences.

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"Forty centuries was a long time" is correct. though it's a plural noun, it makes sense of a singular meaning. for example, forty kilometers is a long distance to walk.

Emamul
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There's two subtle different meanings of "time" at play here.

If you were to say "Forty centuries is a long time" then it's a simple statement of fact, which applies at any point in time, past, present or future.

With "Forty centuries was a long time" it sounds like you are talking about something that happened to you (or someone else), ie a specific time period. That's because the use of "was" implies it's no longer a universal thing, like with "is", and that you must be talking about something more concrete and specific.

It's unlikely that you mean the second sense, since nobody ever experienced a forty-century time period.

Max Williams
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