while being there he joined in voluntary labor on a project
问题描述：
while being there he joined in voluntary labor on a project
为什么 while 后面要用being there 而不是be there
如果这个句子不用省略的形式 改成完整形式 是不是这样？
while he was therehe joined in voluntary labor on a project?
答
此句中,while引导的动名词短语作主句he joined in voluntary labor on a project的时间状语,while引导的是短语,而不是句子.写成完整的形式while he was therehe joined in voluntary labor on a project 是这样没...