(1) 名词子句作介词（preposition）的受词同作动词受词一样，如果 主句 （ main clause ）是过去式时，作介词受词的从属子句也要变成相应的过去时态。
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这样，主要子句（ main clause）是 This is my first time，而 of being here则是修饰 my first time，说明第一次做什么事。
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汉英从属连词比较_其他毕业论文_毕业论文网 Key Words: subordinator; semantic relations; main clause; subordinate [gap=396]关键词：从属连词、语义关系、主从句、比较
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同义词： independent clause
以上来源于: WordNet
N-COUNT A main clause is a clause that can stand alone as a complete sentence. Compare . 主句
In the sentence 'They often go to Italy because they love the food', 'They often go to Italy' is the main clause and 'because they love the food' is a subordinate clause.
在They often go to Italy because they love the food这个句子里，They often go to Italy是主句，because they love the food是从句。
The main clause talks about the likely result.
主句谈论可能的结果。
A purpose or reason clause needs a main clause to make a complete sentence.
目的状语从句和原因状语从句与主句一起构成完整的句子。
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