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--- -ta form + ato (de) = After + clause
___ From 出かける dekakeru
• 私達が 出かけた 後で、谷さんが 来た。
Watashitachi ga dekaketa ato de, Tani-san ga kita.
(litteraly) After we had left, Mr. Tani came,
Mr. Tani arrived after we had left
Grammar: [nv] あと ato
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