_many times,the boy still didn't know how to do the exercise

来源：学生作业帮编辑：搜搜做题作业网作业帮分类：英语作业时间：2024/07/07 03:31:03

_many times,the boy still didn't know how to do the exercises.为什么要用现在完成进行时
而不是现在完成时

Having been told ,这是非谓语动词,不是现在完成进行时,having 这里用-ing 是非谓语动词的形式之一,加ing表示这个谓语的动作与主语是主动关系,这句话可以写成:the boy has been told many times ,the boy still didn't know how to do the exercises.这样就成了两个独立的句子,因为一个句子不能出现两个谓语动词,要想改成一个句子,要么加连词,要么其中一句改成非谓语动词,就如例句的一样.

_many times,the boy still didn't know how to do the exercise having been told mang times ,he still didn't know how to do Having been told many times,he still didn’t know how to do i 语法 ___several times,but the boy doesn't know how to answer t ___ several times,but he still doesn't know how to use the c _many times,but he still made the same mistake. the teacher still didn't know ___ He didn't know ____when the house caught fire.A how to do it 单选 the book,the boy didn't know the answers to the questions He didn"t know what to do the next day The nervous boy didn't know ___A whom to listen B whom he li I didn't know how to do it问题