They are from the USA．Are they from USA?．题目和参考答案——青夏教育精英家教网—

8．They are from the USA．（一般疑问句）
Are they from USA？．

分析他们来自美国．
他们来自美国吗？

解答答案：Are they from USA？原句含有be动词are，将be动词提前，构成一般疑问，故答案是Are they from USA？

点评一、含有be动词（am/is/are/was/were）动词的一般疑问句，通常把be动词调到句首．
二、含有情态动词（can/may/must/could）的一般疑问句，把情态动词调到句首．
三、句子里没有be动词、助动词、情态动词等，就需要加助动词do，does，、did（过去式）来构成疑问句，加上这些助动词后，句子中谓语动词必须用原形．
其句型为：Do/Does/did+主语+动词原形+其它？

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