7．They have to get up early every day．（改為一般疑問句）
Dotheyhave to get up early every day？

分析 他們不得不每天早起．
他們不得不每天早起嗎？

解答 答案：Do they．have to為實意動詞短語，意為"不得不"，此句為一般現(xiàn)在時，故其一般疑問形式必須借助助動詞 do 或 does，這里主語是they，故借助于do，故答案是：Do they．

點評 一、含有be動詞（am/is/are/was/were）動詞的一般疑問句，通常把be動詞調(diào)到句首． 
二、含有情態(tài)動詞（can/may/must/could）的一般疑問句，把情態(tài)動詞調(diào)到句首．
三、句子里沒有be動詞、助動詞、情態(tài)動詞等，就需要加助動詞do，does，、did（過去式）來構(gòu)成疑問句，加上這些助動詞后，句子中謂語動詞必須用原形．  
其句型為：Do/Does/did+主語+動詞原形+其它？

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