You must not do it.
It may not be true.
必然性 : It must be true.
偶然性 : It may not be true.
可能性 : It may be true.
不可能性 : It can't be true.
全体肯定: All of the passengers were alive.
部分否定: Not all of the passengers were alive.
部分肯定: Some of the passengers were alive.
全体否定: None of the passengers were alive.
全体肯定: She has read both articles.
部分否定: She has not read both articles.
部分肯定: She has read either article.
全体否定: She has not read either article.
全体肯定: I always get up early.
部分否定: I don't always get up early.
部分肯定: I sometimes get up early.
全体否定: I never get up early.
1. <認識的可能性>の can は, <認識的可能性>の may が普通, 平叙文で用いられているのと相補分布をなしている.
2. <認識的可能性>の can は, 通例, 疑問文・否定文で用いられて, 話し手の発話時における命題内容の真実性に対する疑いを表わす.