请问句型It's known to us that从句是被动语态吗?请问句型It's known/well-known to us that从句,是被动语态吗?若是,怎么这里用TO US,不用BY US?

请问句型It's known to us that从句是被动语态吗?请问句型It's known/well-known to us that从句,是被动语态吗?若是,怎么这里用TO US,不用BY US? It's known to us that practice makes perfect.与As is known to us,practice makes perfect!这两个句型到底有何区别? 请问It's said that by us从句是被动语态,怎么It's known to us that从句却不是?请问It's said that by us从句是被动语态,这里用的是BY US,而It's known to us that...这句用TO US ,也可以是被动语态?好象不是被动语 it is known to us all that ……是什么句型? 有关as is known to us all,it is known to us all 的辨析1.As is known to us all,the earth is round.2.It is known to us all that the earthe is round.3.what is known to us all is that the whale is not fish but mammal.请问这3个分别是什么从 It's said that从句是被动语态,怎么It's known to us that从句却不是? As is known to us.和It is known to us.后面接什么啊?为啥 It Is known to us 和as is known to us 有什么区别 有没有句型是“It's time to us to do sth? 你好!It's known to us that从句,也是被动语态吗?如是,怎么这里用TO US,不用BY US? it is well known to us that是什么意思 It's known to us all that some of the signs are represented----creaturesAfor Bby Cwith Dof it is known to us all,as is known to us all和what is known to us all有什么区别 It's well-known to all that...请问这句是系表结构还是被动语态?　TO　ALL在句中做什么成分?为什么? 这两个句型的区别!It's...of you to...It's...for you to...请问怎样区分? it's well known 请问there be 句型与 it's 句型的区别 i guess it's going to rain 请问这GOING 在这句子里是什么句型