There is a sentence in an exercise in the Speed Master N4 book:


The expression in brackets should be put in the correct form. The keys state that the correct form is 引越しする. Can する be dropped? Or does Nまで(に)works only when N is an expression of time?

  • 3
    By the way, is it really 入らない in the example sentence, and not 要らない / いらない?
    – Kaskade
    Commented Nov 19, 2023 at 18:15
  • The exercise asks to put the expression, and thus the verb, in the right form. "Can I just omit it?" may be a valid thing to wonder for the example sentence, but omitting it will clearly not be the answer to the exercise. Commented Nov 19, 2023 at 20:00
  • @Kaskade It was an autocomplete typo. Thanks! Commented Nov 20, 2023 at 15:44

1 Answer 1


You can also say 引越しまでに (noun 引越し + particle まで + particle に) , but it is often not thought as a form of verb 引越しする.

  • Is it also the case for other suru verbs? Commented Nov 20, 2023 at 15:45

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