Question

upon放在句首,后面的动词使用被动语态时,是用being done 还是直接写done

Answer 1

这又是一个关于语法和习惯用法的争议的问题,

尽管从语法来看

upon sth.being done

没有错,一般说法是

upon doing sth.

例：

Upon completing the assignment you will get the certificate

You will get the certificate upon completion of the assignment