連詞

　　一.概念

　　連詞是用來(lái)連接詞,短語(yǔ),從句或句子的詞.連詞不作成分.

　　二.相關(guān)知識(shí)點(diǎn)精講

　　1.表示并列關(guān)系的連詞有：and, both…and…, not only… but also…和neither…nor…等

　　1)and：和，并且

　　A：基本用法：

　　"and"表示 "和"、"并且"的意思，用來(lái)連接對(duì)等關(guān)系的字和字，片語(yǔ)和片語(yǔ)，句子和句子。

　　I enjoy basketball , football and table tennis.

　　The weather becomes colder and colder.

　　B:特別用法：

　　祁使句后連接and，有條件句作用，此時(shí)and=if you…,you'll…

　　Go straight on, and you'll see the library.==If you go straight on, you will see the library.

　　2)both…and…既…也…,(兩者)都…

　　A、both…and…構(gòu)成的詞組作主語(yǔ)時(shí),謂語(yǔ)動(dòng)詞用復(fù)數(shù)。

　　Both Jim and Kate are from England.

　　B、both…and…否定句表示部分否定。

　　You can't speak both German and English.

　　Both my father and my mother aren't doctors.

　　3)neither…nor…:既不…也不…

　　neither…nor…連接兩個(gè)并列主語(yǔ)時(shí),謂語(yǔ)動(dòng)詞靠近哪個(gè)主語(yǔ)就與哪個(gè)主語(yǔ)保持 "人稱"和 "數(shù)"的一致，即采取就近原則。

　　Neither I nor he has seen the play before.

　　4)not only…but also…:不但…而且…

　　not only…but also…連接兩個(gè)主語(yǔ)后的謂語(yǔ)動(dòng)詞也遵循就近原則。

　　Not only the mother but also the children are ill.

　　2.表示轉(zhuǎn)折關(guān)系的連詞有：but,  however, yet, still，while等。

　　Mary was a nice girl, but she had one shortcoming.

　　Tom got up early, yet he failed to catch the train.

　　He was very tired, still he kept on walking.

　　Your composition is fairly good, however, there is still some

　　room for improvement.

　　Jane is hard working ,while her sister is quite lazy.

　　3.表示選擇關(guān)系的并列連詞有：or, either…or…,whether… or…等。

　　1)or：或、否則

　　A:基本用法

　　or 表示 "或" 的意思，使用于兩者之中選擇一個(gè)的時(shí)候。

　　----Is your friend English or American? ----American.

　　He doesn't like dumplings or noodles.

　　B:特別用法

　　祁使句后連接or ，表 "如果…,否則…",有轉(zhuǎn)折的意思，此時(shí) or =if you don't …,you'll …

　　Hurry up, or you'll be late.=If you don't hurry up, you'll be late.

　　2)either…or…:或者…或者…; 不是…就是…；要么…要么…

　　A.      either…or…連接兩個(gè)并列主語(yǔ)時(shí),謂語(yǔ)動(dòng)詞靠近哪個(gè)主語(yǔ)就與哪個(gè)主語(yǔ)保持 "人稱"和 "數(shù)"的一致，即就近原則。

　　Either you or I am right.

　　Does either she or they like English?

　　B.      由either…or…引導(dǎo)的否定句是完全否定。

　　She isn't either a student or a teacher.

　　3)whether…or…不管…還是…

　　She is always cheerful, whether at home or at school.

　　4.表示因果關(guān)系的并列連詞有：for(因?yàn)?，so(所以)。

　　He is not at school today, for he has a bad cold.

　　It was late, so I went home.

　　5.引導(dǎo)時(shí)間狀語(yǔ)從句的從屬連詞有：before, after, when, while, as, till, until, since, as soon as等。

　　After they had planted their crops, they took a rest.

　　We have learned six lessons since he began to teach us.

　　As soon as he gets to Beijing, he'll call me.

　　1) when, while, as 都表示"當(dāng)……時(shí)"，when從句謂語(yǔ)動(dòng)詞既可以是瞬間動(dòng)詞也可以是延續(xù)性動(dòng)詞，可用于主從句動(dòng)作同時(shí)發(fā)生或從句動(dòng)作先于主句動(dòng)作發(fā)生。while從句謂語(yǔ)動(dòng)詞只能是延續(xù)性動(dòng)詞，側(cè)重主從句動(dòng)作同時(shí)發(fā)生。as引導(dǎo)一個(gè)持續(xù)性動(dòng)作，多用于主從句動(dòng)作同時(shí)發(fā)生，強(qiáng)調(diào)"一邊……一邊"。

　　When I came in, my father was cooking.

　　I came in when/while my father was cooking.

　　He sang as he walked.

　　2)until用法：當(dāng)主句謂語(yǔ)動(dòng)詞是延續(xù)性動(dòng)詞時(shí)，主從句都用肯定式，譯為"直到……為止"；當(dāng)主句謂語(yǔ)動(dòng)詞是瞬間動(dòng)詞時(shí)，主句用否定式，從句用肯定式，即not…..until, 譯為"直到……才"。

　　Mr. Green waited until his children came back.(格林先生一直等到他的孩子們回來(lái))

　　Mr. Green didn't go to bed until his children came back. (格林先生直到他的孩子們回來(lái)才睡覺(jué))

　　6. 引導(dǎo)條件狀語(yǔ)從句的從屬連詞有：if(如果), unless(除非，如果……不)等。

　　If you don't go soon, you'll be late.=Unless you go soon, you'll be late.

　　7.引導(dǎo)原因狀語(yǔ)從句的從屬連詞有 because, as, since等。

　　because"因?yàn)?quot;語(yǔ)氣最強(qiáng),回答why提問(wèn)時(shí)只能用because，其引導(dǎo)的從句可放在句首或句末；as"由于"、since"既然"語(yǔ)氣不如because強(qiáng)，引導(dǎo)的從句常置于句首；for是并列連詞，語(yǔ)氣最弱，對(duì)前面分句加以解釋或補(bǔ)充說(shuō)明，其引導(dǎo)的分句常置于句末且用逗號(hào)隔開。

　　He didn't go to school because he was ill.

　　As it was raining, we went there by bus.

　　Since everybody is here, let's begin.

　　It must have rained last night, for the ground is wet.

　　注意： because與 so不能同時(shí)使用。

　　8.引導(dǎo)讓步狀語(yǔ)從句的從屬連詞有：although/though(雖然，盡管), even though/if (即使)

　　Although/ Though it is a very young country, it is very rich.

　　Even if/ though you were here yesterday, you couldn't help him.

　　注意：although/though 引導(dǎo)的從句不能與but連用，但可與yet, still連用。

　　9.引導(dǎo)目的狀語(yǔ)從句的從屬連詞有so that和in order that(以便，為了)等。

　　The teacher spoke loudly so that /in order that we could hear him clearly.

　　10.引導(dǎo)結(jié)果狀語(yǔ)從句的從屬連詞有：so that(結(jié)果是)和so/such…that…(如此…以至于)等。

　　It was very cold, so that the water in the bowl froze.

　　He got there so early that he got a good seat.

　　It is such a heavy box that nobody can move it.

　　11.引導(dǎo)比較狀語(yǔ)從句的從屬連詞有： as…as…(與……一樣),not as/so… as…(不及，趕不上),和than(比)等。

　　I know you better than she does.

　　He works as carefully as she.

　　I can't run as/so fast as you.

　　12.引導(dǎo)名詞性從句的從屬連詞有：that和 if/whether(是否)等。

　　We know that the earth goes around the sun.(賓語(yǔ)從句)

　　I wonder if he has received my e-mail. (賓語(yǔ)從句)

　　Whether he'll go there hasn't been decided.(主語(yǔ)從句)

　　注意：在時(shí)間狀語(yǔ)從句和條件狀語(yǔ)從句中，如果主句是將來(lái)時(shí)，從句要用一般現(xiàn)在時(shí)。

　　I'll go on with the work when I come back tomorrow.

　　He won't come unless he is invited.
 

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