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问题: 句法分析

The butterflies that return south are the great-great grandchildren of the butterflies that leftfor the south.

scientists still don't understand how butterflies know when to fly south.

解答:

1.主从复合句 (主句结构:主--系--表)

从句“that return south ”作定语修饰主句的主语“The butterflies ”;从句“that leftfor the south”作定语修饰主句的表语“the great-great grandchildren of the butterflies”。

2.主从复合句 (主句结构:主--谓--宾)

主句主语“scientists”,谓语“still don't understand ”,宾语从句“how butterflies know when to fly south”,
其中“when to fly south”作“know”的宾语。