高中英文第三冊某課句型: 一...就...

介紹了

A: S V as soon as S V (連接詞用法) 與
B: S V upon Ving (介系詞用法) 的互換

ex: The child began to feel hungry as soon as he saw the delicious cake.
= The child began to feel hungry upon seeing the delicious cake.

請問 upon Ving 的句型是否有限制兩件事的主詞需相同?

ex: It began to rain as soon as Andy got off the bus.

像以上這句前後主詞不同是否能用upon Ving代換?

It began to rain upon Andy's getting off the bus. <--這樣的句子OK嗎?

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