What is the difference between it will happen then and it will happen by then? What is the difference?

4 Answers

  • jehen
    Lv 7
    1 month ago
    Favourite answer

    "by then" is akin to a deadline it will happen by then, but could happen anytime before.  "Then" is a akin to an appointment, it will happen at a particular time.  Additionally 'Then' implies causation or enablement, where as "by then" does not.  So if I said "sunrise is at 6am, it will happen then", then whatever is to happen will happen at 6am because the sun has risen.  Sunrise is the gate or prerequisite for it to happen.  If I say "Sunrise is at 6am, it will happen by then", then whatever is to happen should or must happen by 6am.  Sunrise is the deadline, but does act as a prerequisite.    

  • RP
    Lv 7
    1 month ago

    There is a very slight difference. Without "by", "then" becomes a deadline or specific time when something will happen whereas, with "by" before then, it means at any time up to and including "then." In other words, then alone is an unspecified, date certain whereas "by then" is not specific and uncertain.

  • Anonymous
    1 month ago

    "then" in the first sentence implies that "It will happen at the time known to the speaker but "by then" in the second one Rogers something will happen prior to a fixed time.

  • Scott
    Lv 6
    1 month ago

    Then indicates a specific time. By then tells us that it will happen on or before that time.

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