a. 已知的, 有名的know的过去分词相关词组: be known as It is known that be known for make it known that
known单词用法语法
it is known to sb与as is known to sb的区别
it is known to sb与as is known to sb的区别
有这样一道语法选择题：
_____ is known to everybody, the moon travels round the earth once every month.
A. It B. As C. That D. What
此题很容易误选 A，认为此处应填一个形式主语，况且 It is (well) known to … 也是一个常用句型，读起来也很上口，但是选A错了。同学们仔细想想看，假若选 A，空格处填一个形式主语(it)，那么其后就应有一个真正的主语，但事实上没有。但是若句中的逗号改成 that，则只能选 A，因为这样一来，that 便成为一个引导主语从句的引导词。此题的最佳答案是 B，as 引导的是一个非限制性定语从句，可置于主句前(常译为“正如”)或主句后(常译为“这一点”)，句意为“正如大家所知，月球每月绕地球转一周”。
单词：known的近义词、反义词、形近词辨析
family/familiar/unfamiliar/familiarity/home/house/know/known/unknown
记忆：
1. family [ 5fAmili ] n. 家庭, 家族, 家属 Tom has a large family to support. 一大家人靠汤姆生活。
2. familiar [ fE5miljE ] 家庭的，当然是为大家熟悉的，adj. 熟悉的, 常见的。 The coming professor is familiar to all the students as he has been to the school twice. 要来的那位教授对所有的学生都很熟悉，他到这儿已来过两次了。Be familiar with 熟悉；be familiar to 对……来说是熟悉的。
3. unfamiliar [ 5QnfE5miljE] adj. 不熟悉的, 不常见的 What will you do with an unfamiliar letter? Delete it!你将怎样处理一封不熟悉的信件？删除！
4. familiarity [ fE7mili5Ariti ] n. 熟悉, 通晓 The familiarity shows that he has ever studies butterflies.他对蝴蝶如此熟悉表明他对蝴蝶做过研究。
5. home [ hEum ] n. 家, 住宅 adv. 在家, 回家, 在本国 East or west, home is best.东方西方，比不上家乡。 格言： There's no place like home. 金窝银窝，不如咱的狗窝。
6. house [ haus ] n. 房子, 住宅 vt.给...房子住 The housing conditions are much better in the urban areas now.现在城市地区的住房条件比以前好多了。
7. know [ nEu] v. 知道, 了解, 认识 I’m afraid I don’t know you.恐怕我并不认识你。
8. known [ nEun ] adj. 知名的, 大家知道的 The space flight made Mr. Yang Liwei well-known home and abroad.那次太空飞行使杨利伟先生天下闻名。
9. unknown [ 5Qn5nEun ] adj. 不知名的 One year ago, he was an unknown worker.一年以前，他还是一个默默无闻的工人。
另类阅读：
The family bought a new house near the well-known park. Though the kids were unfamiliar with the streets at first, soon the streets got familiar to them. They could leave their home for the park and even the unknown places to enjoy themselves.
与单词：known 相关的例句或者名人名言
The camel is known as the ship of the desert.
骆驼被称作沙漠之舟。
France is known for the Eiffel Tower.
法国因埃菲尔铁塔闻名。
The Irish people are known for their beer and dancing.
爱尔兰人以他们的啤酒和舞蹈而出名。
The calumet, also known as peace pipe, seals their decisions.
他们使用的烟斗叫做“和睦烟斗”，“和睦烟斗”意味着会议决定已形成。
a known fact
大家知道的事实
※A tree is known by its fruit. 观其行而知其人。
※Every tree is known by its own fruit. 观其言行，知其为人。
※A bird is known by its note, and a man by his talk. 闻其歌知其鸟，听其言知其人。
※A bird may be known by its song. 什么鸟唱什么歌。
