Meaning & usage
までに marks a deadline and means no later than that point, used when an action must be completed before a set time. It follows a time noun as in 4時までに or 明日までに, or the dictionary form of a verb as in 着くまでに. Unlike まで, which describes an action continuing up to a time, までに stresses completion before the deadline, so it often appears with verbs of finishing.
Example sentences 7
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早く始めれば昼飯までに終えられる。
If we begin early, we can finish by lunch.
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今週までにはそれを終えてしまいたかったのだが。
I hoped to have finished it by this week.
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私は4時までにその仕事を終えなければなりません。
I have to finish the work by four o'clock.
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そこに着くまでには、ほぼ暗くなっているだろう。
By the time you get there, it will be nearly dark.
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この仕事は月曜日までに終えねばならない。
This work has to be finished by Monday.
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10時までに来ます。
I'll come by 10.
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とにかく、明日までにこの仕事を終えなければならない。
In any case, I must finish this work by tomorrow.
In past JLPT papers
This came up in 13 past exam questions.
And 9 more tests.