一，界说缘由状语从句指在句顶用来阐明主句缘由的从句。引导缘由状语从句的隶属连词有：because（因为）, as（因为）, since（已然）, now(that)（已然）, when（已然）, seeing (that) （因为，鉴于）, considering (that)（思考到）, given (that) （思考到）,for（为）等。
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二、引导缘由状语从句的隶属连词首要的有because,for,in that,for the reason that;as,seeing (that), seeing as;since;now (that); considering (that)等：
the woolly shrank because it was washed badly.毛衣因为洗刷的办法不好而缩水。
i can’t get to sleep because of the noise outside.因为外面声响喧闹我睡不着。
since [as] we’ve no money, we can’t buy it.因为咱们没钱，咱们不能收购它。
seeing that it’s raining, we’d better stay indoors.已然外边鄙人雨，咱们最佳待在室内。
now that you

are here, you’d better stay.你已然来了，最佳仍是留下吧。
※除以上说到的引导缘由状语从句的隶属连词外，when有时也可引导缘由状语从句(标明“已然”)
i won’t tell you when you won’t listen.已然你不想听，那我就不说了。
（上面的比方有些来自网络）
※because不能和so连用。
三，because从句与 because of短语的变换because引导的缘由状语从句有时可与because of 短语变换，because of后加的缘由可认为好或坏。
example：he can’t come because he is ill. / he can’t come because of his illness.
四，隶属连词的用法
① because引导的缘由状语从句一般放于主句的后边，because从句位于句首时要用逗号分隔，放在句末时，可不必逗号分隔。because标明直接缘由，

口气最强， 最合适答复why引导的疑问句。because of 也标明缘由，但它后边不接从句, 只能接名词, 代词或动名词。
②since引导的缘由状语从句一般放于主句之前标明已知的、 显着的理由(差不多是“已然”= now that 的意思)， 较为正式， 口气比because弱。
③ as 引导缘由状语从句时标明趁便阐明的“两边已知的缘由”，富含比照阐明的意味，口气比since弱， 较为正式， 方位较为活络(常放于主句之前)。
④ for引导的是并排句标明缘由但并不阐明主句行为发生的直接缘由， 只供给一些辅佐性的弥补阐明， for引导的并排句只能放于主句之后而且有必要用逗号将其与主句离隔。
五，例题

____ you’ve got a chance, you might as well make full use of it. (1999)a. now that b. after c. although d. as soon as[答案] a[解析] 主句与从句之间存在因果联络， 且“you’ve got a chance”标明一个清楚明晰的缘由， 因而应选用表缘由的now that。
he found it increasingly difficult to read, ____ his eyesight was beginning to fail. (2006北京)a. and b. for c. but d. or[答案] b[解析] “his eyesight was beginning to fail”是“he found it increasingly difficult to read”的缘由， 因而本题应选用可以标明缘由的连词for引导缘由状语从句。
a man cannot smile like a child, ____ a child smiles with his eyes, while a man smiles with his lips alone. (2006湖南)a. so b. but c. and d. for[答案] d[解析] 下划线处之后的语句弥补阐明“a man cannot smile like a child”的缘由， 应选用for表缘由。

（1、2题来历于网络，3题是自个刷题刷到的，觉得这几题非常有意义而且很经典就放上来了）

今日的内容到这儿就差不多了，不得不说说英语的人说话真多规则╭(╯^╰)╮，累死我了qwq
要一同学习的别忘了重视一下鸭~自己日更学习专栏，等待新的小心爱~
谢谢观看~