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Therefore的两种用法一、整句中时一般不放句末，1、按一般副词使用2eg.1、ThereforewemustlearnEnglishwell.2、TheythereforecanlearnEnglishwell.3、Manyfastfoodrestaurant,therefore,haveredfurnitureorwalls.示结果。thereforeso不一样andtherefore。eg.1、Ihadaheadache;thereforeIcouldnotgotoyourparty.2、Iwasill,andthereforecouldnotcome.3、Thesebirdsareverybeautifulandthereforelikedbymanypeople.However的用发1.用作副词(1)表however+形容词或副词+主语+谓语。这样用的howeverhowevermuchheeats,henevergetsfat.用①此用法属however所有用法中②这样用的however与nomatterhow大致同义。如Peoplealwayswantmore,however[nomatterhow]richtheyare.人总是富了还想再富。however[Nomatterhow]hardIworked,shewasneversatisfied.无论我多么努力Don’tlaugh,howeverfunnyitmaybe.无论多么有趣也不要笑。I’lltrytofinishitintime,howeverharditmaybe.要按时完成。④“howeverIrefuse,howeverfavorabletheconditions.不管条(conditions后省去了are)I’dratherhavearoomofmyown,howeversmall(itis),thansharearoom.无论房间Agrammarrule,howevertrue(itis),isuselessunlessitcanbeunderstood.用处。(2)Myfather,however,didnotagree.但Myroomissmall;however,it’scomfortable.我Hesaidthatitwasso;hewasmistaken,however.howeverhoweverdidyougetherewithoutacar?没有汽车你究竟是怎样来的呢?But的用法butwhile替代次句是人物的状态