1. My grammar book says:


    Is it OK to use




  2. My grammar book also says:


    Is it OK to use





  1. Yes, it is ok, but as you did in your example, one needs to insert で between the noun and なくてもいいです.

    明日でなくてもいいです = It does not have to be tomorrow.

  2. If your book just says "It is ok to use Verb/Noun + なければなりません", it is misleading. With nouns, you need to insert は (or が) or で depending on what you want to say, for the phrase to make sense and be grammatical.

    The two sentences below have totally different meanings:

    ワインはなければなりません = Wine is definitely needed (in life). = We cannot live without wine.

    ワインでなければなりません = It has to be wine (for a certain occasion or to go with a certain dish).

    And yes, it is ok to use Adjective/Na-Adjective + なければなりません and your examples are both correct.

  • I typed "1" and "2" but it comes out both as "1". Can someone edit? Thanks. – l'électeur Nov 17 '13 at 0:16
  • 1
    Done :) Use a space at the start of line to indent and keep unnumbered lines "within" the preceding list item. Lines that start without either a space or a number will end the list and ensure that future list items start from 1. – Hyperworm Nov 17 '13 at 0:23
  • To expand slightly: the reason you need the で in 1) is that you're taking the ない form of Nounである - the で isn't a particle in case you might be confused. similarly, in 2) the two cases are based on Nounはある and Nounである respectively. – momerathe Nov 17 '13 at 10:44

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