分析一下这两个英文句子的主谓宾,以及从句
1.We do not know how and why it began because we do not know the complete history of the island.
2.The people who live on the island usually have good teeth,and this helps them to whistle well.
郁闷死了,每个词都简单,可是就是画不出来成分.
可以告诉我这两个句子的主谓宾,以及从句吗?
分别是什么从句...