老师你好！
Sam had lost his wallet while taking his savings to the post office.
此句中连词 while 接目前分词 taking his savings to the post office.课
文注解中说道与 while he was taking his savings to the post office 时间状语用途一致。该怎么样理解 while taking his savings to the post office？
感谢，盼复！
Sam had lost his wallet while taking his savings to the post office.
此句中连词 while 接目前分词 taking his savings to the post office.
课文注解中说道与 while he was taking his savings to the post office 时间状语用途一致。该怎么样理解 while taking his savings to the post office？
【答】while taking his savings to the post office， 是while he was taking his savings to the post office的省略说法。
详细情况可参考：
http://www.yygrammar.com/Article/201501/3815.html
