having done在句首的时候是什么意思?如何用?比如,having finished the homework,they .

having done在句首的时候是什么意思?如何用?比如,having finished the homework,they . 【答好了加分】having done,did,doing,being done having done,having been done 在句首区别区别 请问在高三英语完成句子中,句首什么时候时候用现在分词``过去分词``还有having done ``之类的, having done的句子是什么时态的,having done 咋用~ 在非谓语题目中,having been done 和done 的区别是什么啊? having done的用法 having been done英语语法考验,having been done这是什么语法,它在什么样的情况下正确使用?请大家用自己的话简明讲解? Having done 做状语 在句中的位置一般Having done 做状语一般是 放在句首的 ,那么可以放在句中么?例如：The boy,born on May,1,1911,having completed the courses in the school,was granted graduation.这样的语法结构可 having been done是什么时态? 在高中英语非谓语动词单选中,在句首经常是有 ①Being+动词过去分词 ②动词过去式的选项.两个都可以表示被动,那么怎么区分.在什么情况下用Having done,以及done. have sth.done 里的done在句中是什么成分 having been done和done的区别having been done和done都指过去发生,且有被动含义,在用法上到底有没有什么区别? having been done与done的区别是什么为什么有时候having been可以省略?帮忙举几个例子! not having done 和 having not done 的区别 having been done和having done的区别rt having been done的用法 有没有have to been done有没有这种结构啊,那个什么动作发生在谓语之前的是什么啊,是不是还有个having done 非谓语动词的否定式是having not been done 还是not having been done?放在句首时