ai all的用法和意义？

1.all修饰名词主语时,可放在主语和行为动词之前,但要放在be动词之后（但是若be动词是句子中的最后一个词时,all要放在be动词之前）.如：

All the boys study well.= The boys all study well.孩子们都学习得很好.

They are all steel workers.他们都是钢铁工人.

—Are you Young Pioneers?你们是少先队员吗?

—Yes,we all are.是的,我们都是少先队员.

2.all指“三个（以上）的数目”,反义词是none；both指“两个数目”,反义词是neither.如：

I have three brothers.All of them are college students.我有三个哥哥,他们都是大学生.

He has two sisters.Both of them major in English.他有两个姐姐,她们都主修英语.

3.不能说“all + 代词”,要说“代词+ all”或“all of + 代词”.如：

误：All they like her.

正：They all like her./All of them like her.他们都喜欢她.

4.“All + 冠词（指示代词或物主代词）”=“冠词（指示代词或物主代词）+ whole”.如：

all the world = the whole world全世界

all my life = my whole life 我的一生

注：all可修饰不可数名词或复数名词,the whole不可直接修饰不可数名词或复数名词,应用the whole of.如：

all Shanghai = the whole of Shanghai 全上海

all ink = the whole of ink 所有墨水

all his books = the whole of his books 他所有的书

5.all用于否定句时通常表示部分否定,要表示全部否定可用no,none等.如：

All my friends cannot swim.并非我所有的朋友都会游泳.

None of my friends can swim.我所有的朋友都不会游泳.

I don”t know any of them.他们我都不认识.

6.all不能与what连用,可把what改为that.例如：

误：This is all what I want to say.

正：This is all that I want to say./ This is what I want to say.这就是我要说的全部.

7.“all +地名”,表示“全……的人”；“the whole of +地名”表示“全……的地方”.如：

All America celebrate Independence Day on July 4.7月4日全美国（人民）庆祝独立纪念日.

He has traveled the whole of America.他已经游遍了全美国.

8.“all +抽象名词”=“very +形容词”,前者语气更强.如：

Little Amy is all attention.= Little Amy is very attentive.小埃米非常专心.

He is all kindness to us all.= He is very kind to us all.他对我们大家非常亲切.

9.at all作“完全；根本”解时,多用于否定句；用于条件句时表示“既然；即使”；用于疑问句时,作“到底；在任何程度上”解.如：

If it were not for the sun,we could not live at all.如果没有太阳,我们根本不能生存.

Have you read any of the article at all?那篇文章你到底有没有读过一点