- 22 Feb 2008
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ません sounds more formal. ないです has a colloquial nuance.I understand 要りません and 要らないです are the same in meaning. I just wondered if there is any difference between them. Like when would you use ません and not ない です.
This might be a bit advanced, but there are several hypotheses among linguists about the difference in use between them, for instance, ないです tends to be used with stative verbs(雨は降ってません < 雨は降ってないです), ません is often used for "intention" than "fact"(絶対行きません > 絶対行かないです, 今は時間がありません < 今は時間がないです), ないです is less used than ません in past tense(昨日は時間がありませんでした > 昨日は時間がなかったです), and so on.
I recommend to use ません for situations where the polite form is used, just in case.