need have done ,must have done ,can/could have done ,should
来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/10/04 19:14:56
need have done ,must have done ,can/could have done ,should have done 的区别是什么?意思是什么?主要用于哪种句型?请分别举例说明,
need have done .本人才疏学浅,没见过这种说法,通常是need to be done,表示需要被完成.如:All the housework needs to be done today.(今天需要完成所有家务.)
must have done肯定猜测语气,表示一定已经完成了.如:He must have finished the housework.(他肯定已经完成家务了.)
could have done 表示本可能已经完成某件事,常表示结果与事实相反.can have done 不常见.如:He could have finished the housework if he didn't watch the basketball games.(如果他不看篮球赛,本应该已完成家务了.)
should have done,应该已经完成某事,这个“应该”不是指推测,而是指理论上的,或义务上的.如:According to the cookbook,the cake should have been baked well now.(根据菜谱,蛋糕应该已经被烤好了.)
must have done肯定猜测语气,表示一定已经完成了.如:He must have finished the housework.(他肯定已经完成家务了.)
could have done 表示本可能已经完成某件事,常表示结果与事实相反.can have done 不常见.如:He could have finished the housework if he didn't watch the basketball games.(如果他不看篮球赛,本应该已完成家务了.)
should have done,应该已经完成某事,这个“应该”不是指推测,而是指理论上的,或义务上的.如:According to the cookbook,the cake should have been baked well now.(根据菜谱,蛋糕应该已经被烤好了.)
need have done ,must have done ,can/could have done ,should
could have done和should have done
Could have done would have done should have done
would/could//should/must have done
should/could/must/might have done用法?
can be done was done could be done must have been done will
can't be done.should be done.should have done
could have done和need have
英语:should have done与could have done区别?
should have done和could have done的区别?
虚拟语气 should have done 与 could have done
must have been done must have done