both：英 [bəʊθ] 美 [boʊθ] adj.二者，两者都；pron.二者；adv.二者，二者都；conj.不仅…而且…，…和…都。
both是说两者都怎么样，是指两者的， both的用法有两种，它可以和名词、代词连用，也可以和动词连用，在句中作主语、宾语及同位语，也可作定语 both当形容词的时候，有 both of the boys=both boys =both the boys(两个男孩都...) 接代词的时候是 both of us=we both(我们都...) 当both做副词的时候，放在Be动词，助动词，情态动词之后，行为动词之前 比如说 We both like English. We can both sing.
另外，both 也构成短语both...and...(两者都...) 比如Both Tom and Tina like English.(Tom和Tina都喜欢英语) 切记这里的"like"必须用复数形式。
例句：
She cried out in fear and flung both arms up to protect her face
她吓得大叫，并且抡起双臂护住了自己的脸。
Now women work both before and after having their children
现在妇女在生孩子前后都要去工作。
Put both vegetables into a bowl and crush with a potato masher.
把这两样蔬菜都放进一个碗里，然后用捣土豆器把它们捣碎。
4Any such action would have to be approved by both American and Saudi leaders. 任何这样的行动都必须获得美国和沙特领导人双方的批准。
He had made a friend of both girls.
他和两个女孩都成了朋友。
a. 两者的
ad. 两者都
int. 两者
例句与用法:
1. He is both a soldier and a poet.
他既是个战士，又是个诗人。
2. Both are good.
两者都好。
3. Both his eyes are hurt.
他的两眼都受伤了。
both 表示两着都… 是个副词,也可以做代词,例:
副词:We are both students.
代词:Both of us are students.
它的否定形式是neither 词性和both一样,例:
副词:We are neither STUDENT, 注意是单数名词.
代词:Neither of us IS a student 同样注意也是单数
He is both a soldier and a poet