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问题: 能说is not enough ----吗

一道选择题:
He is too young.He is not __to join the army.
A.old enough B.enough old C.too old D.old too
答案是c。请给我解析为什么A错了

解答:

本题唯一正确的答案是A. 你得到的答案应该是错的。你选A说明语感不错。

enough...to...的否定式就是 not enough...to...,是一个正确且常用的结构。下面给一个《朗文英语词典的一个例句》:
I didn't run fast enough to catch the train。
所以:He is not old enough to join the army,意思是"他还不够参军的年龄",在逻辑上刚好与He is too young相符。

too old...to...本来含否定的意思,not too old...to...就是双重否定了,如果要硬译就是"他年纪还没有大到不能再参军",意思就与He is too young不符。实际上not too old...to...这种结构是不符合英语习惯的。