备考专升本英语：英语语法之全部否定和部分否定！

全部否定和部分否定
eg.All the birds can not fly.
Not all the birds can fly.不是所有的鸟都会飞。
1.部分否定
eg.All the birds can not fly.并非所有的鸟都会飞。
None of the birds can fly.所有的鸟都不会飞。
代词或副词如all,both,every,everybody,every day,everyone,everything,everywhere等与not搭配使用时，表示部分否定，意思为“并非都是"等。
eg.All is not gold that glitters.发光的并非都是金子。=Not all is gold that glitters.
备考专升本英语：英语语法之全部否定和部分否定！
2.全部否定
英语中常用not,none,nobody,nothing,nowhere,neither,never等表示全部否定的概念。
eg.Nothing in the world is difficult for one who sets his mind to it.世上无难事，只怕有心人。
eg.W:Daddy,I've decided to give up science and go to business school.
M:Well,it is your choice as long as pay your own way,but I should warn you that not everyone with a business degree will make a successful manager.
Q:What do we learn from the conversation?
A.The man doesn't have money for his daughter's graduate studies.
B.The man doesn't think his daughter will get a business degree.
C.The man insists that his daughter should pursue her studies in science.
D.The man advises his daughter to think carefully before making her decision.
双重否定
1.在阅读当中出现的频率更高一些。在一个句子中出现两个否定词：not,never,hardly,scarcely,rarely,seldom,few,little,none等，双重否定表示肯定的概念。
eg.No one can command others who cannot command himself.
A perpson can command others who command himself.正人先正己。
eg.Without the ability to think critically,to defend their ideas and understand the ideas of others,they can not fully participate in our democracy.
如果没有能力进行批判性思维，维护自己的观点，并理解他人的观点，他们就不能充分的参与我们的民主政治中来。
2.形式否定，意义肯定
eg.A man can never have too many ties.一个男人可以拥有很多的领带。
A woman can never have too many dresses.一个女人拥有再多的衣服也不为过。
eg.We can hardly praise his achievement too much.对他的成就我们无论怎样赞扬也不过分。
eg.A mother can never be patient enough with her child.一个母亲对她的孩子再怎么耐心也不为过。
A teacher can never be strict enough with his students.一个老师对他的学生再怎么严格也不为过。
这种形式主要运用于阅读当中。