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I have heard about the usage of "be" in specific situations like 2 days, 5 dollars,... For example:

Two days ____ enough for us

Should I use "is" or "are"? I see both of them are appropriate.

marked as duplicate by Edwin Ashworth, Roger Sinasohn, tchrist Jun 18 '17 at 17:04

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    Is if you're treating the two days as a single length of time; are if you're treating them as multiple lengths of time. – Lawrence Jun 18 '17 at 15:32
  • @Lawrence I know that, but what do you think is more appropriate? – Tùng Vương Jun 18 '17 at 15:33
  • It depends - are you treating "two days" as a single length of time, or as multiple lengths of time? – Lawrence Jun 18 '17 at 15:34
  • So both of them can be both correct answers, right? – Tùng Vương Jun 18 '17 at 15:35
  • Whether either or both are "correct" depends on the context. Both are grammatically sound, though. – Lawrence Jun 18 '17 at 15:37