作业帮As we know和As we known有什么区别啊?后面都能跟什么时态?
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/09 10:04:01
As we know和As we known有什么区别啊?后面都能跟什么时态?
As we know和As we known有什么区别啊?后面都能跟什么时态?
As we know和As we known有什么区别啊?后面都能跟什么时态?
As we know是“正如我们知道”,这个结构通常以as 作为关系代词,引导非限制性定语从句,比如As we know,the earth moves around the sun.,这里“as”就在“as we know”这个从句中指代了“the earth moves around the sun”整个主句.
As we know是定语从句,主句与定语从句的谓语表示的动作如果不是同时发生,时态则不要求一致,所以后面没有什么特定的时态要求.比如：
1,表客观存在用一般现在时：As we know,the earth moves around the sun.
2,表过去发生：As we know,the plane crushed yestered.
3,表将来发生：As we know,the plane will crush tomorrow.
As we known本身就是一个错误的结构,所以无论后面跟什么时态,都是错的.
as we know 是现在时.
as we known 单独出现是不正确的！ 因为known是分词，所以一般要用被动式或者完成时 eg. as is known to s.b; as it has been known to s.b
As we all know 、as is known to all、as is well-known 是正确的表达，后面可以跟一般现在时、一般过去式、一般将来时等等好多时态，但没有As we known这种表达形式