Mrs.White has promised that she____ her son a bicycle.应该填 will buy 为什么啊.

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Mrs.White has promised that she____ her son a bicycle.应该填 will buy 为什么啊.
Mrs.White has promised that she____ her son a bicycle.
应该填 will buy
为什么啊.

Mrs.White has promised that she____ her son a bicycle.应该填 will buy 为什么啊.
has promised 现在完成时属于现在时,后面的宾语从句可以用任意时态.
根据句意,怀特夫人已经许诺要给她的儿子买一辆自行车.“ 买自行车”将来时

因为前面是现在完成时，后面就用将来时。
如果前面是过去时，后面就用过去将来时would buy.

考buy sb. sth. 的用法吧

Mrs.White has promised that she____ her son a bicycle.

用 will buy 表示将来时。

因为原句中的意思是：

怀特女士已经许诺要给儿子买一辆自行车。
许诺，是表示还没有发生，要在许诺后买，所以是将来时。

主句是现在完成时态，不是一般过去时态

句意是怀特夫人已经答应这事，就是她要给她的儿子买单车。从句子看，是已经答应她儿子要买，就是还没买，所以的将来时，用will buy没错啊。

嗯，has promised是现在完成时，就是说，Mrs White已经承诺她“会”给她儿子买一辆自行车。has promised 说明承诺发生在过去，但对现在甚至将来有影响，所以用现在完成时，“会”说的是将来要发生的，所以用一般将来时will buy。

buy sb sth=buy sth to/for sb has promise已经承诺因而还没买,暗含将来之意

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