1、定语从句
是指从句在主句中作定语,修饰一个名词或代词;被修饰的名词、代词或词组,即为先行词。
定语从句分为:限制性定语从句和非限制性定语从句。限制性定语从句中,没有逗号,缺少了从句则主句要表达的意思不完整,对先行词起限制作用,如She had a book which(that) was bought from me;非限定性定语从句,从句与主句之间以逗号隔开,去掉从句之后对主句的意思无任何影响,不起限制作用,She had a book,which(that) was bought from me。注意这两句话的重点不一样。
2、同位语从句
在复合句中充当同位语的名词性从句称为同位语从句。
例如,The girls were surprised at the fact that ocean ships can sail up the Great lakes。同位语从句的先行词个数有限,就那么几个考的,可以背一下,通常有news,idea,fact,promise,question,doubt,thought,hope,message,suggestion,words(复数表消息),possibility。
3、表语从句
从句在主句中作表语。主句的“主系表”结构中缺少表语,而由整个从句来充当了表语。
例如,He has become what he wanted to be ten years ago. 此句中,"has become"为系动词,按理来说后面应该接表语,而"what he wanted to be ten years ago”恰好充当了表语。
再有不懂的,可以百度一下,很全面,好好学习英语,一定会有用的!加油!
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