why可以引导名词性从句和定语从句。在名词性从句中,why是连接副词,在从句中充当状语。定语从句中的why是关系副词,关系副词在句中作状语。在两种从句中,why有不同的含义。
例句:
What is hard is to do good all one’s life and never do anything bad.
难的.是一生行善而不做坏事。
This reminded me of what he had once told us.
这使我想起他有一次告诉我们的话。
The problem is whether robots will be smarter than humans.
问题是机器人是否会比人类更聪明。
Scientists have not found answers to the question why there is no life on Mars.
为什么火星上没有生命这个问题,科学家还没有找到答案。