連詞【定義】連詞是連接單詞、短語或句子的一種虛詞，起輔助作用，在句子中不單獨作成分。根據(jù)在句子中所起的作用不同，連詞通常分為并列連詞和從屬連詞。并列連詞用來連接屬于同一層次并具有同等句法功能的詞、短語或句子；而從屬連詞用來連接不同層次，帶有主從關系的詞、短語或句子?！局R歸納】一、并列連詞并列連詞詞義例句and和，又，及Heislaughingandtalking.but但是，可是（表轉(zhuǎn)折）Heispoor,buthonest.or或者（表選擇）Wouldyouliketeaorcoffee?so因此，所以（表結(jié)果）Hewasill,sohecouldn'tgotoschoolyesterday.both...and...兩者都Bothyouandsheareright.notonly...不但Notonlyyoubutalsoeveryoneherelikeswatchingbutalso...而且……footballmatch.either...or...或者或者EitherheorIamright.neither...nor...既不……也不……NeitherthetwinsnorLiLeihasbeentoShanghai.【特例清單】.“祈使句+or+結(jié)果句"="Ifyoudont其中or意為“否則”例：Hurryup,oryouwillbelate.快點,否則你就會遲到了！=Ifyouhurryup,youwon，tbelate.如果快點，你就不會遲到了。=Ifyoudoifthurryup,youwillbelate.如果不快點,你就會遲到了。but“但是”，用來表示轉(zhuǎn)折關系，注意它不能與though,although連用so“所以,因此”用來表示因果關系,注意它不能與because,since,as連用for“因為”，表示原因，主要用來進行補充說明，沒有因果關系notonly...butalso,neither…nor…和either...or...連接兩個主語時，謂語動詞與最近的主語保持一

致；both.??and…連接兩個主語時，謂語動詞要用復數(shù)形式；而aswellas連接兩個主語時，謂語動詞同前面的主語在人稱和數(shù)上要保持一致例：NotonlyIbutalsomymotherisgoingtothemuseum.不僅我而且我的母親也要去博物館。NeitheryounorIamright.你和我都不對。Eitheryouorheisright.要么你對,要么他對。BothLiPingandherfathertakeexerciseeverymorning.李萍和她的父親每天早晨都進行鍛煉。二、從屬連詞分類連詞詞義例句表示時間when當…時Thestudentsweretalkingwhentheteachercamein.while當…時IwasdoingmyhomeworkwhilemyfatherwaswatchingTV.after在???之后rilgotoplayfootballafterIfinishmyhomework.before在…之前Pleaseturnoffthelightbeforeyouleavetheroom.till,until直到…為止rilwaittill/untilhearrives.不到…不Shewon'tgethometill/untilitgetsdark.assoonas一…就UlicallyouassoonasIgettoBeijing.since自從…Hehaslivedheresince1980.表示條件if如果We'llgoforapicnicifitdoesn'train.unless除非，如果不TheywillhaveapicnicunlessitrainsnextSunday.表示原因because因為Hedidn'tcomebecausehewasill.since既然Sincewehavegotreadyforit,let'ssetoff.as因為AsI'mnotathome,pleaseleaveamessage.表示目的sothat以便于Hegotupearlysothathecouldgetthereintime.inorderthat為了Heworkshardinorderthathecangotoagoodcollege.表示結(jié)果so...that如此…以至于…Theboxissoheavythatwecan'tcarryit.such...that如此…以至于…Itissuchaheavyboxthatnobodycanmoveitaway.表不讓步though/although雖然Hewouldbehappythoughheshouldhavetolivealone.Heoftenhelpsothersalthoughheisnotrich.表示比較as像…一樣Doasyoulike.和…一樣HeranasfastasMike.notas...as不及…Itisn'taseasyasyouthink.than比…ShejumpedhigherthanRose.【特例清單】.if意為“是否”時，引導賓語從句；意為“如果”時，引導條件狀語從句。例：Couldyoutellmeifthey41cometomorrow?你能告訴我他們明天會來嗎？Youcangoouttoplayifyourhomeworkisfinished.如果你的作業(yè)做完了，你就可以出去玩了。.從屬連詞so…that…和such…that…都表示“如此以至于”,但用法不同：so…that…結(jié)構(gòu)中的so為副詞，后面跟形容詞或副詞；such...that…中的such為形容詞，后面接名詞（名詞前可以有形容詞或副詞修飾）。彳列