there exists a certain doubt among the workers as to whether he will finish the task in a short tim
问题描述：
there exists a certain doubt among the workers as to whether he will finish the task in a short tim
这句话的句型结构
答
这是宾语从句.关键词是DOUBT.AS TO （== ABOUT) 引出了后面的句子WHETHER HE WILL FINISH THE TASK IN A SHORT TIME.这个句子作AS TO 介词短语的宾语.其实,AS TO 这两个字可以省略.DOUBT 的具体内容就是WHETHER HE W...那There exists可以换成It was吗？你好，不可以，但可以改写成THERE IS,