這又是一個關于語法和習慣用法的爭議的問題,
盡管從語法來看
upon sth.being done
沒有錯,一般說法是
upon doing sth.
例：
Upon completing the assignment you will get the certificate
You will get the certificate upon completion of the assignment可是如果要使Upon completing theassignment變?yōu)楸粍诱Z態(tài)，那be動詞要不要省略，我只記得after和before的是不能省的，但不清楚upon按時態(tài)要說 upon the assignment being completed但一般人說 upon completing the assignment語言不僅是語法，也是習慣，俗語說，language is usage(即 language is what common usage makes it)比如“這本書一旦完成就要出版”，用upon，主語為書，怎么造The book will be published upon its completion （句中）Upon its completion the book will be published （句首）你還是沒明白我的意思呢~~~~~upon its completion 如果改種說法，是upon beingcompleted 還是upon completed我明白你的意思，我是說不可說 upon being completed 或 upon completed人家笑你的。