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1）too...to...，too...for...
He is too young to go to school.（=He is not old enough to go to school.）他还不够上学的年龄。
That's too much for me.这我可受不了啦。
但下列句中无否定含义：
He is too ready to speak.（≈He is talkative.）他太爱讲话了。
I'm only too glad to help you. 能为您效劳，我高兴极了。
2）stop （prevent，keep，hinder，protect，save，prohibit，dissuade...）...from...
Intact skin can protect the body from being invaded by germs.未受损的皮肤可以保护身体不受细菌侵害。
3）利用虚拟语气表否定
You should（ought to) have done it better.
你本应做得更好。（还不够好）
I could have come earlier.
我本来能早点来的。（实际上没有早来） I wish he were here now.
我希望他现在能在这儿。（实际上他不在）
If only he had asked for my advice!
他当初要能征求我的意见就好了！（实际上没有）
They would rather die than surrender.
他们宁死不降。
4）用before引导的从句表“来不及……,不等，未……先……，以防”等否定含义
The bell rang before I could look over my answers.
我还没来得及看一下答案铃就响了。
Put on more clothes before you catch cold.
多穿点衣服以防感冒。
5）预先安排的事未办到或计划落空
I had hoped to save some more money to buy a new car.
我本希望多攒点钱买辆新车。
6）用比较级句型表否定
He knows more than he lets on.
这件事他了解得很多，但不肯承认。
I know better than to believe him.
我才不相信他那一套呢。
He's more brave than resourceful.
他勇敢有余，谋略不足（有勇无谋）。
7）其它含否定概念的句型
God knows how high the mountain is.
谁知道这山究竟有多高。
What's the use of complaining? 抱怨有什么用？
Mind your own business！莫管闲事！
How is it possible？哪有这种可能 ?
