-----------------------------------
なくなる， 無くなる
1. to be lost (e.g. luggage), to be missing
2. to be used up, to be run out, to be exhausted, to be consumed, to be reduced to zero, to not occur any more
3. to disappear (e.g. pain), to be lost (e.g. a dream, confidence)
丢失（如行李），失踪；用完，耗尽；消失，迷失
が
1. indicates the subject of a sentence
2. indicates possession
3. but, however, (and) yet, though, although, while
4. and
5. used after an introductory remark or explanation
6. regardless of ..., whether ... (or not), no matter ...
7. indicates a des...
tbd
