完全否定是指：具有否定意义的代词或副词，加上肯定式的谓语，能使句子表示全部否定。
各类定义
全部否定
（1） 当 all, both, every, everybody, everything, each 等代词及 always, wholly, everywhere 等副词出现在句中时，谓语动词的否定形式只表示部分否定，意为“不都是，不总是，并非全”等。
This book is not to be found everywhere. / All these answers are not correct.
（2） 具有否定意义的代词或副词，如：no, none, nobody, nothing, neither, never, nowhere 等，加上肯定式的谓语，能使句子表示全部否定。
Neither of them is my friend. / Nobody is fond of the book.
表示肯定
（1） no sooner… than, hardly/ scarcely/barely …. When 表示“一……就”
No sooner had they rushed out of the house than the earthquake happened.
（2） Cannot…too, cannot…enough 表示“越……越好，无论怎么……也不过分”。
John is such a good student that we can’t praise him too much. / You cannot be careful enough.
（3） Nothing more than 表示“仅仅是，非常”
There is nothing ke likes more than a cup of tea.
（4） No / none other than 表示“正是， 不是……正是”
This is no other than the newspaper you want. / She is none other than my daughter.
（5） Nothing but / except 与 none but 意为 “仅仅，只有……才”
The boys want to do nothing but watch TV. / None but a fool would do such a thing.
（6） Cannot but 表示 “只好，只得”
I can’t but go with you.
（7） Not … till / until 表示 “直到……才”
He didn’t go home until he had finished all his work.
（8） Not a little 表示 “狠，极”， not a bit 表示“一点也不”, not a few 表示“很多”
He gave me not a little trouble. / She is not a bit afraid.
肯定表否定
（1） 副词 little 与动词 believe, expect, think, realize, know, imagine, guess 等连用时，通常置于动词前，表示完全否定意义。
I little expected that things should turn out like this.
When I first came to this country, I little thought that I should stay here so long.
（2） “too+adj.+ to do” 用来表示“太……以至不……”
This stone is too heavy for me to lift.
但当 too 后是 easy, kind, ready, glad, likely, willing, eager, delighted, pleased 等一类表心情、态度或倾向性的形容词时，too 表“非常，很”，后面的不定式不再有否定意义。
He is too delighted to see his former classmate.
（3） Anything but 表示“绝对不，一点也不”。
The problem is anything but difficult. / He is anything but an actor.
（4） More than… can 意为“无法，难以，简直不”.
This is more than I can bear.
（5） More A than B 表示“是 A 不是B”，“与其说是B,不如说是A”。
He is more brave than wise (有勇无谋)。 I was more angry than frightened.
其他注意点
（1） “主语 + be + the last + n. + to do / that ”是一种加强语气的否定句，意思是“最不……的，决不至于……”。
He is the last man that I want to invite.
（2） 当 too …to 结构中的 too 前有only, but, all 时， 意思是“非常，很”，后面的不定式没有否定意义。
I’m only too glad to help you.
（3） Too … not to…表示“太……不会不……”或“非常……，一定能……”。
She is too angry not to say it. (他在盛怒之下，难免要说出这样的话来。)
（4） Not a 和no 修饰名词充当表语时，两者意义不同。
He is not a singer. (不是歌唱家。) He is no singer. (根本不懂唱歌)