he had lost his wallet while taking his savings to the post office

题目

he had lost his wallet while taking his savings to the post office
为什么当中省略was taking
he had lost his wallet while was taking his savings to the post office
不是定语从句中才会省略be动词的吗?

答案

状语从句也可以啊,当主句的主语跟从句的主语一致时,从句可以省略主语和部分谓语（通常是be动词）,这里是省略了he was