英语有时也可使用这样“否定之否定”，即所谓的双重否定。
There was no one who did not feel sympathy for the victims of the accident.
＝Everyone felt sympathy for the victims of the accident. 没有人不同情那位意外的牺牲者。
It is not unusual for a family to have more than one car to use in daily life.
＝It is usual for a family to have more than one car to use in daily life. 一个家庭在日常生活中使用一辆以上的车子并不特别稀奇。
Nobody had nothing to eat.
＝Everyone had something to eat. 大家都有东西吃。
双重否定就内容而言虽是表肯定的，但和原本就是肯定形者并不完全相同。比方说，not unusual (并非不寻常) 与usual (普通) 在感觉上就不完全相同，多了一点儿犹豫的情绪。
预测考点：
1、never...without...型双重否定，其意为：没有～决不……；要～一定会……每当……就；一……就
The dog never crosses a street without stopping at the curb. 那只狗每次要过街时，都会在人行道边缘停下来。
He never passes by the zoo without thinking of that fierce tiger.每当他从动物园走过时，他就会想起那头凶猛的老虎。
It never rains without pouring.一下雨就是倾盆大雨。
2、双重否定用于表示肯定的内容时，因形式上仍属否定句，所以附加问句为肯定形。如：
No Japanese breakfast is complete without misosoup, is it? 没有味噌汤的日式早餐就不够完整，不是吗?
加载中,请稍侯......
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