立彬の日本語
事故の原因は警察が捜査中だった。
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The cause of the accident was being investigated by the police.
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事故， じこ， ことゆえ
1. accident, incident, trouble
2. circumstances, reasons
意外，事故
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原因， げんいん， げいいん
1. cause, origin, source
原因
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警察， けいさつ
1. police
2. police officer
3. police station
4. self-appointed enforcer (of a rule, standard, etc.), busybody, vigilante, gatekeeper
警察；警官
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捜査， そうさ
1. search (esp. in criminal investigations), investigation, inquiry, enquiry
搜查，调查，质问，盘问
の
1. indicates possessive
2. nominalizes verbs and adjectives
3. substitutes for "ga" in subordinate phrases
4. (at sentence-end, falling tone) indicates a confident conclusion
5. (at sentence-end) indicates emotional emphasis
6. (at sentence-end, risi...
句尾起强调作用；助词，表示所有关系
は
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis
指示句子的主题
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...
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