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Both：adj.两个的，两者的adv.并，又，两者都pron.双方都，两者都conj.既…且①both表示两者都…，有多种词性。例：副词：Wearebothstudents.代词：Thebrothersaregoodatplayingbasketball.Bothwilltakepartinthegame.形容词：Both(the)instrumentsarevaluabletothisprocess.连词：Bothcopperandsilveraregoodconductorsofelectricity.铜和银都是良好的导电体。②它的否定形式是neither，词性和both一样，例：Weareneitherstudent.Neitherofusisastudent.=Eitherofusisnotastudent.③Both可以和名词、代词连用，也可以和动词连用，在句子中做主语、宾语及同位语，也可以做定语。1）both和名词、代词连用both+(of)+the/物主代词/指示代词/+名词Bothofthecatsareasleep.IboughtbothofthesebottlesinChinatwoyearsago.Bothofhisdaughtersaredoctors.在人称代词前一定要用bothof，不能说bothwe,bothus,但可以说usboth,themboth.Bothofuslikeskating,Iwantbothofthem.2）both直接修饰名词，不加ofBothchildrenwonprizes.注意：不能说bothofchildren，可说bothofthechildrenI’vegotoilonbothhands.注意：不能说bothofhands,可说bothofmyhands.④当both在句中作主语的同位语时，也可以与动词连用，both在句中的位置通常用于be动词、助动词或情态动词之后，实义动词之前。1）放在be动词之后Thechildrenarebothlovely.TheyarebothfromAustralia.注意：在感叹句或者简略答语中，both应该置于be之前。Howbeautifultheybothare!--AreyoubothfromJapan?--Yes,webothare.2）放在行为动词前WebothlikewatchingTV.Theybothwanttogoshopping.3）当谓语动词是由几部分组成时，both要放在第一个助动词后面Wehavebothstudiedacting.Theroomshavebothbeencleaned.⑤both做代词，可单独使用，其后不接名词Thebrothersaregoodatplayingbasketball.Bothwilltakepartinthegame.--Whichonedoyouwant?--I'lltakebothplease.注意：both与not连用，是部分否定Boththedoorsarenotopen.⑥both…and…两者都，能连接各种并列成分。BothMaryandTinaaregirls.(连接两个主语)Ifyouaresuccess,youcangetbothmoneyandpower.(连接两个宾语)Thesebooksarebothinterestingandhelpful.(连接两个表语)Itisnecessarytobuildalotofpetrochemicalworks,bothbecauseofChinaisrichinpetroleumandbecausethereisagreatdemandforpetrochemicals.(连接两个状语从句)