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のだ， んだ
1. the expectation is that ..., the reason is that ..., the fact is that ..., the explanation is that ..., it is that ...
……的样子，预期是……，原因是……，事实是……，解释是……，情况是……
に
1. at (place, time), in, on, during
2. to (direction, state), toward, into
3. for (purpose)
4. because of (reason), for, with
5. by, from
6. as (i.e. in the role of)
7. per, in, for, a (e.g. "once a month")
8. and, in addition to
9. if, although
tbd
