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のです， んです
1. the expectation is that ..., the reason is that ..., the fact is that ..., the explanation is that ..., it is that ...
tbd
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
