why這個特殊疑問詞的意思是“為什麼”，通常是對原因進行提問。
如：He went to the United States because he wanted to study there. 他去美國因為他想去那裏學習。如果對because提問，可以是Why did he go to the United States? 而這句話的同義句可以是What did he go to the United States for?
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