(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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无主句 Non-Subject Sentence ; subjectless sentence ; subjectlessness
连接主句和从句的 subordinating
主题句 topic sentence ; theme lines ; top sentence ; Thesis statement
放在主句后 because
引导的从句置于主句后 for
通常主句用现完成时 Since
只有主句 I could help you
引导的从句置于主句前 as
做主句 Can you show me
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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。
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.
从句说的是过去，主句指的是现在。
我们车间使用的这种机器是中国制造的。 但是，如果从句和主句的动作在将来不同的时间发生，则两部分都要用来将来时
Such machines as are used in our workshop are made in china.
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