不定冠词：a,an,the a,an用于一个事物,不能用于两个或两个以上,an用于元音前【aeiou】
the专指上文的事物；this is a pen .the pen is long这是用the
副词；修饰动词,放在动词之前
介词表示场所、位置的介词:at,in,on,under,by,near,between.
表示方向的介词:into,out of,along,acros,through,to,from.
at,in
at 在某地点(表示比较狭窄的场所) 返回
at school
at home
at No.2 Baker Street
at a factory
I'll meet him at the Beijing railway station.
in 在某地(表示比较宽敞的场所)
in Beijing
in China
in the world
in the street
She was born in China.
on,under,over,above,below
on a.在...上面,有接触面
on the desk
There are two maps on the wall.
b.在...靠近...的地方
on the right
on the river
above 在...上方
Our plane flew above the clouds.
over 在...正上方,是under的反义词 返回
There is light over Li Ming.
A few birds were flying over the sea.
under 在...下面;在...之内
under the table
under the jacket
The dog is under the table.
below 在...下方(不一定是正下方)
There are a lot of fishes below the surface of the water.
near,by
near 近的,不远的
near = not far
Is there a bus stop near here
by 在...旁边,距离比near要近
by the window
by me
between,among,around 返回
between 在两者之间
What's the difference between A and B
among 在三者或更多的之中
There is a beautiful house among the trees.
He is very popular among the students.
around 环绕,在...周围,在...四周
We sat around the table.
They walked around the street.
in front of,behind
in front of 在...的前面;在...的前部
The is a tree in front of the house.
There is a big desk for the teacher in front of the classroom.
behind 在...后面 是 in front of的反义词 返回
There is a tree behind the house.
in,into,out of
-----------------借介词简单
表语；一般放在be动词或系动词之后,构成系表结构.
定于；简单理解就是形容词,修饰名词的
谓语；主谓宾听过吧,就是一个动词
等等等等,多死了