[考題] 請問as soon as的代換
各位大大好
請問一下一個文法，小弟不太確定這個觀念是否正確
As soon as he saw Mary, he turned around.
可以代換成
On/Upon seening Mary, he turned around.
但是如果今天兩個句子主詞不同，變成
As soon as Mary left, Tom called me.
可以改成
On/Upon Mary's leaving, Tom called me.
第二句這種用法好像聽誰講過，但我找句型文法書沒有
很明確指出，所到這間請教各位大大
跪謝
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