complex sentence - 微思作业本

问题描述：

complex sentence
1.Monarch butterflies,which migrate to Mexico each year,are guided by instinct.
这句是复句,但我不是很明白第一个逗号之后一定要用which/who,etc等等吗?而第2个逗号后是否不用再加which/who,而且我不明白这句子简化了什么,用处是什么?
2.Geese mate for life unlike humans who,according to the divorce rate,seem to have trouble committing to just one person.
为什么谁要写在第1个逗号前?第2个逗号后的动词是否按照句子中的名词单众数来决定是否加S吗?

1个回答分类：英语 2014-10-17

问题解答：

我来补答

1.Monarch butterflies,which migrate to Mexico each year,are guided by instinct.
这个句子的主句是Monarch butterflies are guided by instinct.
which migrate to Mexico each year是一个定语从句,修饰主语Monarch butterflies.which/who指代Monarch butterflies,一定不能省.这个句子如果不用定语从句的话可以这样讲：
Monarch butterflies migrate to Mexico each year,and they are guided by instinct.
2.Geese mate for life unlike humans who,according to the divorce rate,seem to have trouble committing to just one person.
这个句子的主句就是Geese mate for life.unlike...之后的部分作状语,补充说明主句的意思.who seem to have trouble committing to just one person是定语从句修饰humans.所以seem不加S,因为humans为复数.according to the divorce rate只是一个插入词组,可以放在句中,也可以放在句首和句末.
这个句子也可以这样表达：
Unlike humans who seem to have trouble committing to just one person,according to the divorce rate,geese mate for life.

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