why这个特殊疑问词的意思是“为什么”，通常是对原因进行提问。
如：He went to the United States because he wanted to study there. 他去美国因为他想去那里学习。如果对because提问，可以是Why did he go to the United States? 而这句话的同义句可以是What did he go to the United States for?
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