both的三种用法 both用法有哪些( 二 ) _both用法

1.Bothe (of them)have been to Beijing.(主语)他们两人都去过北京.
2.There are two English books on the table.He wants to read them both in a short time.(同位语)桌上有两本英语书,他想在短时期内阅读这两本书.
3.Steel and petroleum both play an important part in the development of industry and agriculture.(同位语)钢和石油这两样东西在工农业发展中起着重要作用.
4.He and I are both from Tianjin.(both作同位语.注意both在本句中的词序和上两句不同.)他和我都是天津人.
三、“both…and…”起连接词作用,作“两者都”、“又……又”、“不但……而且”
注意：“both…and…”能连接各种并列成分,甚至两个句子.
1.Both copper and silver are good conductors of electricity.(连接两个主语)铜和银都是良好的电导体.
2.The molecules of common salt all contain atoms of both the gas and the metal which compose the salt.(连接of的两个宾语)食盐分子都具有构成食盐的气体和金属这两种物质的原子.
3.Alloys are both useful and important.(连接两个表语)合金既有用又重要.
4.To do work,you must both exert force and move something.(连接两个动词短语)为了作功,你必须既施加力又推动某个东西.
5.Copper is an important conductor,both because of its high conductivity and because of its abundance and low cost.(连接两个状语)铜是一种重要的导体,因为它的导电率高,而且资源丰富,价格又低.
6.It is necessary to build a lot of petrochemical works,both because China is rich in petroleum and because there is a great demand for petrochemicals.(连接两个状语从句)由于中国石油丰富,而对石油化学产品需要量又大,所以有必要建立许多石油化工厂.
四、注意“both+否定式谓语+…”构成部分否定：
1.Both (the)instruments are not precision ones.并非这两个仪器都是精密仪器.
2.Both of the books are not helpful.这两本书并非都是有益的.
如果要将上述两句改成全部否定,则就应写成：
1.Neither instrument is precision one.(=Either instrument is not precision one.=Either of the instruments is not precision one.)这两个仪器都不是精密仪器.
2.Neither of the books is helpful.(=Eit
her of the books is not helpful.=Either
neither、either、both的用法区别
一、neither、either、both的用法
1、Neither的用法
1)代词。意为“两者中任何一方都不”both的反义词，作主语时谓语动词用单数。
Neither of the books is mine.
这两本书没有一本是我的。
2)形容词。修饰名词时，名词使用单数。
Neither boy can swim.
两个男孩都不会游泳。
3)连词。Neither与nor连用：neither—nor— 意为“既不——也不——”连接两个并列的句子成分(连接主语时，谓语动词就近选择)

both的三种用法 both用法有哪些( 二 )

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