-----------------------------------
公私， こうし
1. public and private matters, official and personal affairs, professional and personal lives
tbd
-----------------------------------
けじめをつける， ケジメをつける， けじめを付ける
1. to draw the line (between two situations), to make a clear distinction, to make it clear where one stands
2. to take clear responsibility for (mistakes, etc.)
tbd
-----------------------------------
なければならない， なければなりません， なければいけない
1. have to do, must, should, ought to
必须，应该
