VOA慢速英语:Officials in US Look for Fixes to Carp Problems

both的用法

Both可参与构成名词词组，也可和动词连用，还可与and构成并列连词。在使用时，要注意下列几点：

　　一、Both和both of后都可接复数名词，构成名词词组。但Both后的名词前可有定冠词、指示代词或物主代词作修饰限定，也可没有；both of后的名词前却一定要有定冠词、指示代词或物主代词作修饰限定。

　　如：可以说both(the these，her) children；也可以说both of the(these，her)children；但一般不说both of children。

　　Both of后可接人称代词宾格，both后则不可；但人称代词宾格后可接both。可以说both of us(you，them)，一般不说both us(you，them)，但可以说us(you，them)both。

　　二、Both与动词连用时，大多数放在系动词be之后，其它动词之前。

　　如：His parents are both workers.

　　They both enjoy reading.

　　若句中谓语动词包含情态动词或助动词时，both大多放在第一个情态动词或助动词之后。

　　如：The bridges must both be built this year.

　　两座桥都必须在今年修建。

　　kate and Mary have both gone to English.

　　凯特和玛丽都去了英国。

　　三、Both可与and构成并列连词，连接两个性质相同并在句中作相同成分的并行结构。

　　如：Both he and his brother are good at English.

　　(连接两个主语)

　　She can both dance and sing.

　　(连接两个谓语动词)

　　Mary is both kind and beautiful.

　　(连接两个表语)

　　四、含both的句子变为否定时，是将both改为neither。

　　如：当肯定句为Both of the boys are clever.(两个男孩都聪明)时，否定句当为Neither of the boys are clever.(两个男孩都不聪明)。Both后接复数名词，neither后接单数名词，动词的人称和数也要随之变化。若把句子变为Both of the boys are not clever，则是不完全否定。意思是：并不是两个男孩都聪明(一个聪明一个愚笨)。

　　五、含both…and…的句子变为否定句时，将both…and…改为neither…nor..，连接的两个部分若是名词，可以是单数，也可以是复数。

　　如：I know both the man and the woman.

　　我既认识那男子，也认识那妇女。

2.The underwater barrier is meant to shock the carp into turning back.

is meant to为了，打算

例句：Where were you meant to is guarding?
       你打算防守哪里？

3.The state wants to remove millions of carp to protect an endangered species native only to Utah Lake, the June sucker fish.

native to产自，本土的，土生土长的

例句：The fungi native to a region
      一个地区的真菌

4.Now there are so many, experts say up to twenty metric tons a day could be removed with nets over a period of several years.

up to高达，多达，相当于as many as

例句：I can take up to four people in my car.
      我的汽车最多能坐四个人。