20.They like to eat potatoes because they are delicious.(對劃線部分提問)
Whydothey like to eat potatoes?

分析 他們喜歡吃土豆因為很美味,
為什么他們喜歡吃土豆?

解答 答案:Why do.劃線部分是because引導(dǎo)的原因狀語從句,提問用疑問詞why,后加一般疑問句語序,like是實意動詞,借助于do構(gòu)成一般疑問句,故答案是Why do.

點評 要理解劃線部分的含義,以及在句中的句子成分,判斷出疑問詞,疑問詞后需跟一般疑問句語序.

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