立彬の日本語
そのかばんは忘れ物なんだ。
tbd
The bag has been left behind.
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その， そん， 其の
1. that, the
2. part (as in "part two")
3. um ..., er ..., uh ...
那个；部分（如“第二部分”）
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かばん， カバン， 鞄
1. bag, satchel, briefcase, basket
tbd
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忘れ物， わすれもの
1. lost article, thing left behind
2. leaving something behind, forgetting something
遗失物品
は
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis
指示句子的主题；表示与另一选项（无论是否明确提及）形成对比；表示强调