complex sentence
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?
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Monarc...