他们还没决定什么时候买房．They haven't decided when to buy a house．题目和参考答案——青夏教育精英家教网—

12．他们还没决定什么时候买房．They haven't decided when to buy a house．

分析 They haven't decided when to buy a house．

解答答案：They haven't decided when to buy a house．结合句意可知表达的动作发生在过去，对现在造成一定的影响，故用现在完成时have/has+过去分词，主语they，故have，加上not构成否定，decide后加疑问词+to do sth作为宾语，buy a house买房，故答案是They haven't decided when to buy a house．

点评疑问词和动词不定式（wh-+to do）．疑问词部分包括疑问
代词who，whom，what，which和whose以及疑问副词when，where和how．此外，连接词"whether"也适用．

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