As we all know.为什么要加 As 顺便说说As的用法,我是初中生,简短一些

as we all know . As you know,为什么要加as as we all know是什么意思 as we all know it 英文 用法 答疑有as long as we know,as well as we know,as soon as we as we all know后面加逗号吗 as we all known 还是 As we all know 正确?用不用分词形式?那为什么有as is well 英语问题：as we all know的know加n吗? as we all know中的as是什么词性? AS WE ALL KNOW,SUCCESS____________hard work as we all know同义替换 as .as .的用法