宁夏高考英语知识点讲解：形式否定意义肯定。英语中有些句子形式上是否定的，但是内容含义上却是肯定的。现将这种常见的句式结构归纳如下：

一、 cannot wait 后跟不定式， 意为“急于做”，表示强调的肯定

例1 I couldn‘t wait to see her. 我渴望见到她。

例2 I cannot wait to read the book. 我非常渴望读到这本书。

二、 cannot/couldn‘t＋too意为“越……越……　，非常，无论怎样……也不过分”

在此结构中，cannot 也可改用can hardly，scarcely，never，impossible;too也可改用over，enough等。

例3 You cannot be too careful. 你越小心越好。

例4 We can hardly praise him too much.对他我们无论怎么赞扬也不过分。

例5 A man can never have too many friends. 朋友越多越好。

例6 He cannot see you quickly enough. 他想很快见到你。

三、 not… until/ till 意为“直到……的时候才”

例7 People take no thought of the value of time until they lose it. 人们失去时间后才知道时间的价值。

例8 We never know the worth of water till the well is dry. 直到井干了我们才知道水的重要。

例9 It was not until the next day that I knew that truth. 直到第二天我才知道真相。

例10 He did not go to bed until his mother came back. 直到他母亲回来他才睡觉。

四、否定词＋but

1. no…but 意为 “都……， 没有……不……”。

例11 There is no man but has his faults. 人皆有过。

例12 No one believes but she will succeed. 人们相信他会成功。

例13 There is no one but knows him. 人人都认识他。

2. never (not)…but (that) 意为 “每当……， 总是……， 没有哪次不是……”。

例14 I never see you but I think of my mother. 每当看见你时，我总是想起我的母亲。

例15 It never rains but it pours.每次下雨都是倾盆大雨。

例16 He will not be angry but that he is offended. 人们惹了他他才会生气。

3. nothing but /none but 意为 “仅仅，只，只有……才”。

例17 We can see nothing but water. 我们只能看见水。

例18 The boys want to do nothing but play football. 男孩们只想踢足球。

例19 None but me knew what happened. 只有我知道发生了什么事情。

例20 He chose none but the best. 他只选最好的。