We will be in danger if we do not refuge in the cellars of our
houses when a tornado comes.
这个句子不看“when a tornado comes”，只看“We will be in danger if
we do not refuge in the cellars of our houses”的话，“We will be
in danger”是主要子句，“if we do not refuge in the cellars of our
houses”是从属子句
小弟的问题是：“We will be in danger”加“if we do not refuge in
the cellars of our houses”已经是主从复合的结构；“when a tornado comes
”这个句子也是从属子句 那“We will be in danger if we do not refuge in the
cellars of our houses when a tornado comes.”这整个句子结构是不是可以分
析成：“we do not refuge in the cellars of our houses”是主句，“
when a tornado comes”是从句，要并入“We will be in danger”这个主句里
，“we do not refuge in the cellars of our houses when a tornado
comes”要把它变成从句用 if 引导呢？
还是说可以分析成：“We will be in danger ”是主句， “if we do not
refuge in the cellars of our houses”是从属子句，从属子句充当主要子句里
的某一个成份，因“if we do not refuge in the cellars of our houses”
这个从属子句已经并入“We will be in danger ”当副词用(副词子句)，所以对“
when a tornado comes”来讲，“We will be in danger if we do not
refuge in the cellars of our houses”这整个句子是“主要句”呢？
以上 感谢大家
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