的用法有兩種,它可以和名詞、代詞連用,也可以和動詞連用,在句中作主語、賓語及同位語,也可作定語.現(xiàn)將其用法歸結(jié)如下：
1)both與名詞、代詞連用
(1)both＋(of) ＋the/ 物主代詞/指示代詞+名詞,如：
①Both of the cats are asleep.兩只貓都睡著了.
②I bought both of these bottles in China two years ago.
兩年前我在中國買了這一對瓶子.
③Both of his daughters are doctors.他的兩個女兒都是醫(yī)生.
(2)both直接修飾名詞時(shí),不加of.如：
①Both children won prizes.兩個孩子都得了獎.
【注意】不能說both of children,但可以說 both of the children.
②I've got oil on both hands.我兩手都是油.
【注意】不能說both of hands,可說both of my hands.
(3)在人稱代詞前一定要用both of,不能說 both we或 both us,但可以說us both,them both等.如：
①Both of us like skating.我們倆都喜歡滑冰.
②I want both of them.兩個我都要.
2)both與動詞連用
當(dāng)both在句中作主語的同位語時(shí),也可與動詞連用,both在句中的位置有以下三種情況：
(1)放在是動詞be之后.如：
①The children are both lovely.這兩個孩子都很可愛.
②They are both from Australia.他們兩個都是澳大利亞人.
【注意】在感嘆句或簡略答語中,both應(yīng)置于be之前.如：
③How beautiful they both are!他們倆多漂亮啊!
④----Are you both from Japan?----Yes,we both are.
“你們倆都是日本人嗎?”“是的,我們是.”
(2)放在行為動詞前.如：
①We both like watching TV.我們倆都喜歡看電視.
②The men both looked French.那兩個人看起來都像是法國人.
(3)當(dāng)謂語動詞是由幾部分組成時(shí),both要放在第一個助動詞后面.
如：
①We have both studied acting.我們倆都學(xué)過演戲.
②The rooms have both been cleaned.這兩間屋子都已打掃過了.
3)both作代詞時(shí),可單獨(dú)使用,其后不接名詞.如：
①The brothers are good at playing basketball.Both will take part in the game.這弟兄倆人籃球打得好,他們倆都將參加比賽.
②----Which one do you want?
----I'll take both please.
“你要哪一個?”“兩個我都要.”
【注意】both與not連用,是部分否定.如：
①Both the doors are not open.兩扇門并不都開著.
Both的用法及注意事項(xiàng)
一、形容詞both作“兩”、“雙”
1.Both (the)instruments are valuable to this process.（定語）這兩個儀器對這個過程都是很有價(jià)值的.
2.Both (the)student have made a good few experiments on electricity.（定語）這兩個學(xué)生都做了不少電學(xué)實(shí)驗(yàn).
二、代詞both作“兩人”、“兩者”
1.Bothe (of them)have been to Beijing.（主語）他們兩人都去過北京.
2.There are two English books on the table.He wants to read them both in a short time.（同位語）桌上有兩本英語書,他想在短時(shí)期內(nèi)閱讀這兩本書.
3.Steel and petroleum both play an important part in the development of industry and agriculture.（同位語）鋼和石油這兩樣?xùn)|西在工農(nóng)業(yè)發(fā)展中起著重要作用.
4.He and I are both from Tianjin.（both作同位語.注意both在本句中的詞序和上兩句不同.）他和我都是天津人.
三、“both…and…”起連接詞作用,作“兩者都”、“又……又”、“不但……而且”
注意：“both…and…”能連接各種并列成分,甚至兩個句子.
1.Both copper and silver are good conductors of electricity.（連接兩個主語）銅和銀都是良好的電導(dǎo)體.
2.The molecules of common salt all contain atoms of both the gas and the metal which compose the salt.（連接of的兩個賓語）食鹽分子都具有構(gòu)成食鹽的氣體和金屬這兩種物質(zhì)的原子.
3.Alloys are both useful and important.（連接兩個表語）合金既有用又重要.
4.To do work,you must both exert force and move something.（連接兩個動詞短語）為了作功,你必須既施加力又推動某個東西.
5.Copper is an important conductor,both because of its high conductivity and because of its abundance and low cost.（連接兩個狀語）銅是一種重要的導(dǎo)體,因?yàn)樗膶?dǎo)電率高,而且資源豐富,價(jià)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.（連接兩個狀語從句）由于中國石油豐富,而對石油化學(xué)產(chǎn)品需要量又大,所以有必要建立許多石油化工廠.
四、注意“both+否定式謂語+…”構(gòu)成部分否定：
1.Both (the)instruments are not precision ones.并非這兩個儀器都是精密儀器.
2.Both of the books are not helpful.這兩本書并非都是有益的.
如果要將上述兩句改成全部否定,則就應(yīng)寫成：
1.Neither instrument is precision one.(=Either instrument is not precision one.=Either of the instruments is not precision one.)這兩個儀器都不是精密儀器.
2.Neither of the books is helpful.(=Either of the books is not helpful.=Either book is not helpful.)這兩本書都不是好書.