it doesn't matter that /if you don't know him well .请问it 是形式主语吗?后面的that/if 从句是主语还是宾语从句呢?

it doesn't matter that /if you don't know him well .请问it 是形式主语吗?
后面的that/if 从句是主语还是宾语从句呢?

it 是形式主语指代后面 that /if you don't know him well ,所以是主语从句
你不太了解他并没关系

主语从句哈！

it 是形式主语， 后面那个是 真正的主语。

是形式主语 后面的从句是真正的主语