Given (that) you are all here, I will show you round. (that可以省略)
Considering (that) he is a child, we let him go.(that可以省略)
Now (that) you are all here, let's try and reach a decision. (that可以省略)
Seeing (that) he is determined to carry the project through, I helped him.(that可以省略)
老师们,比如以上引导状语从句的连词加的that,这个that是什么意思呢,这些连词本来不就可以引导句子吗,为什么还要加that?
这几个连词严格意义上讲只能算是准从属连词(quasi-subordinator),即严格讲并不是从属连词,而是过去分词given、现在分词considering,seeing 或副词now。现在分词considering和seeing后接的是名词性that从句作宾语,that引导宾语从句是可以省略的。given后接的that从句为保留宾语从句,仍然是名词性从句,that也是可以省略的。now后接的是关系副词that引导的定语从句,关系副词that引导定语从句,that总是可以省略的。由于这些结构常用来作原因状语,that从句中有主谓结构,这样given (that)、considering (that)、now (that)、seeing (that) 表现得就像一个从属连词似的,于是语法学家就把它们重新分析为从属连词了。但严谨的语法书会把它们称为准从属连词,以区别于because,if 这样的真正的从属连词。真正的从属连词后面是不可以用that的。
类似的准并列连词还有很多的,例如:
provided (that),providing (that),supposing (that),in case (that), ... ...
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