这句话的后半句的语法是什么?on my return ,这是有什么语法?I can confirm that I received your previous email on my return to the office earlier this month

这句话的后半句的语法是什么?on my return ,这是有什么语法?
I can confirm that I received your previous email on my return to the office earlier this month

on my return 在你的句子里面是时间状语,等于as soon as I returned

介词短语做地点状语。

一...就。 介词on的特殊用法