9b英语语法讲解
9b英语语法讲解
这里针对9b英语语法的相关知识，进行了一定的讲解。下面是学习啦小编给大家整理的9b英语语法，供大家参阅!
9b英语语法：从属连词
① 连词类型
从属连词用来引导从句。常见的从属连词有：
(1)引导时间状语从句的after, before, when, while, as, until, till, since, as soon as等。
(2)引导条件状语从句的if, unless等。
(3)引导原因状语从句的because, as, since等。
(4)引导目的状语从句的so that。
(5)引导让步状语从句的though, although, even though等。
(6)引导结果状语从句的so that, so„that, such„that等。
(7)引导比较状语从句的than, as„as等。
(8)引导名词从句的that, if , whether等。
② 连词辨析
(1) while, when, as
这三个连词都可引导时间状语从句，但用法有所不同。
1) 当某事正在进行的时候，又发生了另一件事。While, when, as 都可用来引导表示“背景”的时间状语从句。例如：
As/When/While I was walking down the street I noticed a police car.
2) 当两个长动作同时进行的时候，最常用的是while。例如：
While mother was cooking lunch, I was doing my homework.
3)当两个短动作同时发生，表示“一边„一边”时，最常用的是as。例如： She looked behind from time to time as she went
4) 当从句是瞬间动作，主句是延续性动作时，通常用when。例如：
When John arrived，I was cooking lunch.
(2)as, because, since , for
这四个词都可表原因，但用法有区别。
1) 如果原因构成句子的最主要部分，一般用because。因此，because引导的从句往往放在句末。例如：
I stayed at home because it rained.
2) 如果原因已被人们所知，或不如句子的其它部分重要，就用as或since。since比as稍微正式一点。as和since 引导的从句一般放在句子的开头。例如： As he wasn’t ready, we left without him.
Since I have no money, I can’t buy any food.
3) for用来补充说明一种理由，因此，for引导的从句几乎可以放在括号里。For引导的句子不放在句子的开头。例如：
I decided to stop and have lunch----for I was feeling quite hungry.
(3)if, whether
在引导一般疑问句充当的宾语从句时，皆可用。例如：
I wonder whether (if) you still study in that school.
在下列情况下，只能用whether,不能用if：
1) 引导主语从句时。例如：
Whether he will come to the party is unknown.
2) 引导表语从句时。例如：
The question is whether I can pass the exam.
3) 在不定式前。例如：
I haven’t decided whether to go there or not.
9b英语语法：宾语从句的种类
1. 由that引导的宾语从句。that只有语法作用，没有实在的意义，在口语和非正式文体中可以省略。例如：
He said (that) he wanted to stay at home.
She doesn’t know (that) she is seriously ill.
I am sure (that) he will succeed.
2. 由连接代词who, whom, whose, what, which和连接副词when, where, why, how引导的宾语从句。这些连接代词和连接副词在宾语从句中充当某个成分。例如：
Do you know who (whom) they are waiting for?
He asked whose handwriting was the best.
Can you tell me where the No.3 bus stop is?
I don’t know why the train is late.
3. 由if或whether引导的宾语从句。if和whether在句中的意思是“是否”。例如：
I want to know if (whether) he lives there.
He asked me whether (if) I could help him.
(二)宾语从句的语序
宾语从句的语序应为陈述句的语序。例如：
I hear (that) physics isn’t easy.
I think (that) you will like this school soon.
Can you tell me how I can get to zoo?
Please tell me when we’ll have the meeting.
(三)宾语从句的时态
1. 如果主句的时态是一般现在时，宾语从句该用什么时态就用什么时态。 如： I don’t think (that) you are right.
Please tell us where he is.
Can you tell me how I can get to the railway station?
2. 如果主句的时态是一般过去时，宾语从句只能用相应的过去时态(一般过去时， 过去进行时， 过去将来时，过去完成时)。例如：
He asked what time it was.
He told me that he was preparing for the sports meet.
He asked if you had written to Peter.
He said that he would go back to the U.S. soon.
3. 如果宾语从句所陈述的是客观真理，其时态常用一般现在时。例如： Our teacher said that January is the first month of the year. Scientists have proved that the earth turns around the sun.
9b英语语法：定语从句
一、定语从句的概念
在复合句中,修饰某一名词或代词的从句叫定语从句。被修饰的名词或代词叫先行词,定语从句一般放在先行词的后面。
二、定语从句的关系词
引导定语从句的关系词有关系代词和关系副词,常见的关系代词包括that,
which, who(宾格whom,所有格whose)等,关系副词包where, when, why等。关系代词和关系副词放在先行词及定语从句之间起连接作用,同时又作定语从句的重要成分。
三、定语从句的分类
根据定语从句与先行词的关系,定语从句可分为限制性定语从句及非限制性定语从句。限制性定语从句紧跟先行词,主句与从句不用逗号分开,从句不可省去,非限制性定语从句主句与从句之间有逗号分开,起补充说明作用,如省去,意思仍完整。
四、关系代词的用法
1. that 既可以用于指人,也可以用于指物。在从句中作主语或宾语,作主语时不可省略,作宾语可省略。例如:
Mary likes music that is quiet and gentle.玛丽喜欢轻柔的音乐。(that作主语)
The coat (that) I put on the desk is blue.我放在桌子上的那件外套是蓝色的。(that作宾语)
2.which用于指物,在句中作主语或宾语,作主语不可省略,作宾语可省略。例如:
The building which stands near the train station is a supermarket.位于火车站附近的那座大楼是一家超市。(作主语)
The film (which) we saw last night was wonderful. 我们昨天晚上看的那部电影很好看。(作宾语)
3.who, whom用于指人,who 用作主语,whom用作宾语。在口语中,有时可用who代替whom, 也可省略。例如:
The girl who often helps me with my English is from England.经常在英语方面帮助我的那个女孩是英国人。(作主语)
Who is the teacher (whom) Li Ming is talking to? 正在与李明谈话的老师是谁?(作宾语)
注意:(1)当定语从句中含有介词,介词放在句末时,who, that, which可省略,但介词在关系代词前时,只能用“介词+which/whom”结构。例如:
This is the house in which we lived last year.这是我们去年居住的房子。
Please tell me from whom you borrowed the English novel.请告诉我你从谁那借的这本英文小说。
(2)含有介词的固定动词词组中,介词不可前置,只能放在原来的位置上。例
如:
This is the person whom you are looking for. 这就是你要找的那个人。
(3)that 作介词的宾语时,介词不能放它的前面,只能放在从句中动词的后面。例如:
The city that she lives in is very far away.她居住的城市非常远。
(4)关系词只能用that的情况:
a. 先行词被序数词或形容词最高级所修饰,或本身是序数词、基数词、形容词最高级时,只能用that,而不用which.例如:
He was the first person that passed the exam. 他是第一个通过考试的人。
b.被修饰的先行词为all, any, much, many, everything, anything, none, the one等不定代词时,只能用that,而不用which.例如:
Is there anything that you want to buy in the shop? 你在商店里有什么东西要买吗?
c.先行词被the only, the very, the same, the last, little, few 等词修饰时,只能用that,而不用which.例如:
This is the same bike that I lost.这就是我丢的那辆自行车。 d. 先行词里同时含有人或物时,只能用that, 而不用which.例如:
I can remember well the persons and some pictures that I saw in the room.我能清楚记得我在那个房间所见到的人和一些照片。
e.以who或which引导的特殊疑问句,为避免重复,只能用that.例如: Who is the girl that is crying? 正在哭泣的那个女孩是谁?
f.主句是there be 结构,修饰主语的定语从句用that,而不用which.例如: There is a book on the desk that belongs to Tom. 桌子上那本书是汤姆的。
(5)关系词只能用which,而不用that 的情况:
a.先行词为that, those时,用which, 而不用that.例如:
What’s that which is under the desk? 在桌子底下的那些东西是什么? b.关系代词前有介词时,一般用which,而不用that.例如:
This is the room in which he lives. 这是他居住的房间。
c.引导非限制性定语从句,用which, 而不用that.例如:
Tom came back, which made us happy. 汤姆回来了,这使我们很高兴。
五、关系副词的用法
(1)when指时间,其先行词表示时间,在句中作时间状语。例如:
This was the time when he arrived.这是他到达的时间。
(2)where指地点,其先行词表示地点,在句中作地点状语。例如: This is place where he works.这是他工作的地点。
(3)why 指原因,其先行词是原因,起原因状语作用。例如:
Nobody knows the reason why he is often late for school. 没人知道他为什么上学总迟到。
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