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1、辨析As is known to all 和 It is known to all that 等It is known to us that+句子 主语从句 As is known to us all, 后面是逗号 固定用法 定语从句二、as作关系代词的用法关系代词as引导定语从句时，既可以单独使用，也可以与其他词连用，其用法要比that和which更为复杂。1. as引导定语从句与其他词连用a)用于the same.as结构中This is the same book as I read last week.这本书和我上周读的那本是一样的。b)用于such.as结构中I dont like
2、such books as he recommends.我不喜欢他推荐的那些书。c)用于so +adj. + a/an + n. (单数) + as 结构中I am not so strong a man as I was.我已经没有从前那么强壮了。2. as单独引导定语从句as单独引导定语从句时，先行词可以是一个词，也可以是一个句子或短语。例如：a) She is late, as is often the case.她迟到了，这是经常的事。(先行词是整个主句)b)To shut your eyes to/turn a blind eye to facts, as many of you d
3、o, is foolish.对事实视而不见-你们好多人都是如此的愚蠢。(先行词是不定式短语)What is known to us is that+句子 whether how to do As it is known to all 是可以的，它和 as is known to all 是相同的意思，都是“众所周知”，而用法上面略有些不同， as is known to all 只可以用在句首或句尾，用“，”隔开。而as it is known to all不仅可以放在句首，还可以后面加“that”从句。As is known to us是AS引导的非限制性定语从句,后面加句子以,隔开.It
4、is known to us IT是形式主语,后加that+句子而it is known to all 是形式主语的典型，只用于如it is known to all that our teacher is beauful.谢谢参考哦希望可以帮到你，都是正确的答案句子1。As is known to us all, the earth is round. 定从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.
5、 主从As is known to us all在句子中充当状语，是对句子的修饰成份 its known to us all是句子主干的一种普遍形式，后面加that接从句，it实为从句部分的代词，避免了句子的头重脚轻。三个句子，头两句意思是一样的，说法稍微不同而已，第一句译为“众所周知，地球是圆的”第二句“地球是圆的是我们都知道的。第三句中，由What引导的从句作主语，That后面的从句作宾语，是一种稍微复杂的表达方式，实际意思相差无几，逐字译为“我们都知道的事是鲸鱼不是鱼是哺乳动物这件事。”1. ( ) that the earth is round.A. As is known to al
6、l B. As you seeC. It is known to all D. As is seen A B C D的区别？2. Whether ways will be found to stop pollution or not is just ( ) worries the public.A, why B. which C. that D. what 并翻译一下这句1 C若选A,应为:As is known to all, the earth is round.BD的用法与A相同.2 DWhether ways will be found to stop pollution or not
7、为主语从句,what worries the public为宾语从句.句意为:民众担忧是否能找到阻止污染的方法.Who is the best in class is still up in the air. since的语气比because弱，但比as强。since和as引导的从句一般放在句子的开头。since和as的主要区别是：用as引导原因从句语气较弱，所说明原因是附带，而since表示原因暗示着是稍加分析之后才能推断出来原因。引导原因状语从句的连词原因状语从句一般由because, since, as, for引导。注意as,because,since和for的区别:如果原因是构成句子的最主要部分,一般用because。because引导的从句一般不放在句子的开头。例如:I missed the train because I got up late.注:对于以why开头的问句,一般只能用because引导的从句来回答。如果原因已为人们所知,或不如句子的其余部分重要,就用as或since、since比as稍微正式一些。as和since引导的从句一般放在句子的开头。例如: