主语从句:That he is right is known to all of us.宾语从句:We all know (that) he is right.

问题描述:

主语从句:That he is right is known to all of us.宾语从句:We all know (that) he is right.
为什么主语从句中是known 而不是被动词knew

主语从句的主句部分是That is known to all of us.这句话是被动语态.他是对的这件事为我们所知.
被动语态中要用动词的过去分词.而know是原形,knew是过去式用于一般过去时态,known是过去分词可以用于被动语态和完成时态.明白了吗?