初中英语语法连词词专项习题
[ Because, since, as, for ]
because, as, for, since这几个词都是表示“原因”的连词，语气由强至弱依次为：because→since→as→for;其中because, since, as均为从属连词，引导原因状语从句；而for 是并列连词，引导并列句。
1. because表示直接原因，它所指的原因通常是听话人所不知道的，其语气最强。常用来回答why的提问，一般放于主句之后，也可以单独存在。例如：(1)I stayed at home because it rained. 因为下雨我呆在家里。
(2)Because Lingling was ill, she didn't come to school. 玲玲因病，没有上学。(3)—Why is she absent? 她为什么缺席？—Because she is sick. 因为她病了。
此外，在强调句型中，只能用because。例如：
(4)It was because I missed the early bus that I was late f or school. 我上学迟到是因为我没有赶上早班汽车。
2. since侧重主句，从句表示显然的或已为人所知的理由，常译为“因为”、“既然”，语气比because稍弱，通常置于句首，表示一种含有勉强语气的原因。例如：
(1)Since he asks you, you'll tell him why. 他既然问你，那就告诉他为什么吧。(2)Since everyone is here, let's start. 既然大家都到齐了，我们就出发吧！
(3)Since I understood very little Japanese, I couldn't follow the conversation. 我日语懂得不多，因而听不懂对话。
3. as是常用词，它表示的“原因”是双方已知的事实或显而易见的原因，或者理由不是很重要，含义与since相同，但语气更弱，没有since正式，常译为“由于，鉴于”。从句说明原因，主句说明结果，主从并重。例如：
(1)We all like her as she is kind. 我们都喜欢她，因为她善良。
(2)As I had a cold, I was absent from school. 因为我感冒了，所以没去上课。
(3)As Xiaowang was not ready, we went without him. 由于小王没有准备好，我们只好不带他去了。
4. for用作连词时，与because相似，但它所表示的原因往往提供上文未交待过的情况。for不表示直接原因，表明附加或推断的理由，因此for被看作等立连词，它所引导的分句只能放在句子后部(或单独成为一个句子)，并且前后两个分句间的逻辑关系不一定是因果关系，其间用逗号隔开，且for不可置于句首，for的这一用法常用在书面语中，较正式。例如：
(1)The days are short, for it is now December. 白天短了，因为现在已是十二月份。(2)It must have rained, for the ground is wet. (从“地面潮湿”作出“下过雨”的推测，但地湿并不一定是下雨所致, for不可以换为because。)
(3)The ground is wet because it has rained. (“下雨”是“地上潮湿”的直接原因。) 前后两个分句间有一定的因果关系时(有时很难区分是直接原因，还是推测性原因)，for与because可以互换使用。例如：
(4)I could not go, for / because I was ill. 我没能去，是因为我病了。
(5)He felt no fear, for / because he was a brave boy. 他没有害怕，因为他是个勇敢的男孩。
Because/as
because 引导的是必然原因，as引导一般原因。必然原因是指某事发生必会导致另一件事实。
一般原因语气还有其因果关系不是很明显。以下两个句子请体会The floor is wet,because it rained this morning.
As the floor is wet, it might rain this morning.(地板湿也可能是其他原因，以此看，as引导原因从句还有猜测的意味。)
Because/for
这两个词的意思很相近，通常是可以互换使用的。为了安全起见，最好用because引导从句，因为同because引导的从句相比，for引导的从句（英文中称为for－clause）的用法要受到某些限制：
1 for引导的从句不能位于它所解释的动词之前：Because it was wet he took a taxi．因为下雨，他叫了一辆出租车。（这里不能用for。）
2 for引导的从句不能位于not，but或任何连词之后：
He stole，not because he wanted the money but because he liked stealing．他偷东西，并不是因为他想要钱，而是他有这种毛病。（这里不能用for。） 3 for 引导的从句不能用于回答问题：—Why did you do it？
—I did it because I was angry．—你为什么这么做？
—因为我生气才这么做的。（这里不能用for。）
4 for引导的从句不能单单用来复述已讲过的话，而必须包括新的容：He spoke in French．She was angry because he had spoken in French．他讲法语。因为他讲法语，她生气了。（这里不能用for。）但是可以说：She was angry，for she didn’t know French．她生气了，因为她不懂法语。（这里用for是正确的，也可用because。）之所以有这些用法上的限定，其理由是for引导的从句不能直接说明某一特定动作发生的原因，而只能提供一些起帮助解释作用的附加说明。例句如：
The days were short，for it was now December．天短了，现在已是12月了。
He took the food eagerly，for he has eaten nothing since dawn．他狼吞虎咽地吃了起来，因为他从天亮就没吃过东西。
1. He can speak English_______ Chinese.
A. but
B. also
C. so
D. and
2. Physics is not so easy, _______I like it very much.
A. but
B. or
C. since
D. because
3. Will Tom wait for her at home ______ at the library?
A. or
B. as
C. so that
D. both
4. She has a son _______ a daughter.
A. but
B. and
C. so
D. or
5. I'll give her the gift ______ she arrives.
A. so
B. before
C. as soon as
D. since
6. Tom was ____ill that we had to send for a doctor.
A. so
B. very
C. and
D. too
7. The woman was____ angry_____ she couldn't speak anything.
A. neither…nor
B. either…or
C. both…and
D. so…that
8. ______we got home it was very late.
A. When
B. While
C. Because
D. As
9. We heard clearly_____ she said.
A. what
B. which
C. before
D. because
10. I can't sleep well at night, ______I often feel very tired in the day.
A. so
B. because
C. and
D. or
11. When you're learning a foreign language, use it, ______ you will lose it.
A. but
B. or
C. then
D. and
12. --- Can you play football?
--- Yes, I can, ______ I can't play it very well.
A. or
B. and
C. but
D. so
13. Study hard, ______ you will fall behind.
A. and
B. but
C. so
D. or
14. My favorite is action movie ______ I think it's exciting.
A. and
B. because
C. but
D. so
15. The boy is very smart, ______ many of his classmates like him.
A. but
B. so
C. or
D. for
16. He has never heard______ seen such a thing before.
A. nor
B. and
C. or
D. since
17. _________ John _______I are policemen.
A. Neither ... nor
B. Either ... or
C. Both ... and
D. Not only... but also
18. Mr Smith teaches ______well ______ his lessons are not easily forgotten.
A. very ... that
B. quite ... but
C. so ... as
D. so ... that
19. He didn't go to sleep ______he finished his homework.
A. till
B. before
C. after
D. until
20. I didn't buy the dictionary yesterday ________ my aunt would give me one.
A. until
B. because
C. if
D. before
21. The runner fell _______ he quickly got up and went on running.
A. or
B. and
C. but
D. down
22. Wait for me in the room _______ I come back.
A. until
B. and
C. so
D. or
23. I'll return the books to the library ______ soon as possible.
A. as
B. so
C. just
D. but
24. Go along the road, _______ you'll find the market at the end of it.
A. when
B. and
C. or
D. though
25. You'll be late ______ you don't get up early tomorrow morning.
A. if
B. when
C. before
D. until
26. It was late. She washed her face ______ went to bed.
A. or
B. and
C. so
D. but
27.He shouted aloud ______he ran alone.
A. after
B. before
C. when D .as
28.Please return the book to me _____you come back.
A. as soon as
B. when
C. while
D. as
29..Ring me up____ you come to my house.
A. though B as C. before D .then.
30. I must stop writing now ,______I have rather a lot of work to do.
A .a
B .so C. when D. since
31.The bus didn’t leave _____ everyone get on .
A .after
B .while
C .until D. when
32.I’ll leave a message _____ he will know whe re we are .
A .so that B. as soon as C. for D. that
33. My sister is ____young ____he can’t go to school .
A, too , to B. enough; to C. so that D. as ;as
34. His brother got up earlier ____ he could catch the bus .
A. as if B .so C . so that D .than
35 .It is almost three years ____I saw he last .
A .when B. since C. after D. that
36.---I’m going to the supermarket .
----Will you get me some chocolates ____you are here ,mum .
A .since
B because
C if
D . while
37 .Mr Green came to China in 2000,______he has lived here ever since.
A . and B. or C .but D. for
38 .____ they are brothers , they don’t look like each other at all.
A, Because B .Though C. When D, As
39 .I know nothing about it ____ my brother told me yesterday.
A .because B. since C. until d. so
40. He failed _____ because he isn’t clever ______ because he didn’t work hard.
A. not only …..but also
B.both ….and
C. either …or
D. not …but
41.The teacher wondered why he had ____questions.
A. so much B .so many C such much D . such many
42. We were swimming in the lake ____suddenly the storm started .
A. when
B. while C until D . before
43. We can_____ see ____touch the air .
A .not only ,but also
B .both, and
C . either ,or
D . neither ,nor
44. You can____ stay at home _____ go to my hometown with me .
A. not ,only
B. either and C .both or D. either or
45. We left in _____a hurry _____we forgot to lock the door .
A. so , so
B. so ,that C . such ,that D . such so
46. __Judy, you look so tired.
__Yes. I did not go to bed ____ it was twelve last night.
A . when B. unless C. until D. after
47. She was so interested in the book that she has read it for three hours ____ she realized it.
A. until
B. before
C. after D .when
48. Jack spend much money on books ____ he is so rich.
A. though
B. when
C. if
D. because
49John feel asleep ____ he was listening to the music.
A. after
B. before
C. while
D. as soon as
50. She does not feel like playing basketball now, ____, she is not good at it.
A. so
B. or
C. but
D. besides
51. Mother is ill,_____ Father cooked for us instead.
A. but
B. or
C. so
D.and
52.----It’s 9 o’clock now .I must go .
-----It’s raining outside .Don’t leave _____it stops.
A. when
B. since
C. while D .until
53.Would you like to go to the concert with me?
-----I’d love to ______ I can’t .
A. or
B. but
C. so
D. and
54. ---Our holiday cost a lot of money .
----Did it ?Well ,that doesn’t matter ____you enjoyed yourselves.
A. if B unless C while D. or
55.He didn’t come to school yesterday ,____he was ill.
A. if
B. because
C. when
D. before
56.----Can you guess who will be the first to cross the finish line ?
---Sandy. Jane didn’t run so fast _____ she did last time.
A. than
B. so C .that D as
57 Nothing can stop the sandstorm ____ more and more trees are planted.
A. unless
B. if
C. when
D. while
58. I have to finish the work now ____ I will fall behind others.
A. and
B. or
C. but
D. so
59. D o you prefer apples ____ grapes?
A. to
B. than
C. or
60. I met Miss Green ____ I was walking across the bridge, but I did not say hello to him.
A. before
B. after
C. until
D. while
61. I can not afford to buy a CD player ____ it is too expensive.
A. after
B. though
C. because
D.until
62. I would like to play football with you ____ I have got a meeting now.
A. and
B. or
C. but
D. so
63. Edison never give up, ____ he failed many times.
A. and
B. though
C. or
D. so
64. You should make a plan ____ you do anything important.
A. before
B. after
C. though
D. until
65. Forests help to keep water from running away, ____ drought does not often happen.
A. and
B. but
C. so
D. though
66. We all like Han Mei ____ she is kind and helpful.
A. so
B. and
C. because
D. but
67. We will not never give up our plan ____ happens.
A. however
B. whatever
C. whenever
D. wherever
68. The box is so heavy ____ I have to ask someone to help me.
A. to
B. because
C. that
D. for
69. It was so late, ____ the farmers went on working in the field.
A. and
B. or
C. so
D. but
70. The little boy is only six years old, ____ he can make model wonderful cars.
A. but
B. so
C. or
D. and
71. Shirley has passed the exam ____ she is busy with her hard work.
A. because
B. when
C. since
D. though
72. Linda was just going out shopping ____ the telephong rang.
A. while
B. when
C. after
D. because
73. I want to know ____ Jack still lives in that house.
A. that
B. if
C. weather
D. where
74. I bought a present for my friend, ____ she did not like it at all.
A. and
B. but
C. so
D. or
75.They did not start the work ____ their teacher came back.
A. until
B. while
C. as soon as
D. if
76. Hurry up! ____ you will be late for the film.
A. And
B. But
C. Or
D. Because
77. When you are learning English, use it, ____ you or lose it.
A. but
B. or
C. then
D. and
78. The doctors tried their best to save the patient’s life ____ failed.
A. or
B. so
C. but
D. because
79. Study hard _____ you are sure to have a good result.
A. or
B. and
C. for
D. but
80. Sam was reading a newspaper ____ his brother fell on the ground.
A. when
B. whether
C. as soon as
81. I tried to call you ____ I heard from him, but you were not in.
A. since
B. while
C. until
D. as soon as
82. Jack is only four years old, ____ he can draw beautiful pictures.
A. but
B. so
C. or
D. since
83. I hardly know anything about it ____ you told me.
A. since
B. after
C. until
D. when
84. I have not see her ____ she left Lanzhou.
A. while
B. when
C. since
D. from
85. WeiHua always helps others ____ she is very busy.
A. though
B. if
C. because
86. None of us knew what had happened ____ we heard the news.
A. after
B. until
C. when
87. I left my umbrella in my room. Could you wait ____ I go back to get it.
A. when
B. if
C. while
D. before
88. He is so tired that he fell asleep ____ he went to bed.
A. as if
B. even though
C. ever since
D. as soon as
89. Come a little earlier next, ____ you will miss the best the part.
A. and
B. but
C. or
D. till
90. The Yellow River is ____ the Changjiang River.
A. not so long as
B. as long as
C. not long as
D. longer than
91. There goes the bell. Hurry up, ____ you will be late for class.
A. and
B. that
C. or
D. but
92. There is a lot of traffic in this city, ____ look both ways before crossing the street.
A. so
B. and
C. but
D. for
93. Which one is yours, A ____ B？
A. but
B. and
C. or
94. Tom is ill at home, ____ he can not come here.
A. so
B. if
C. because
95. All of us will be happy ____ you can come with us.
A. while
B. if
C. but
D. or
96. He is only five years old, ____ he can write novels.
A. so
B. but
C. or
97. Tomorrow we will go to the city park ____ it is sunny.
A. as soon as
B. when
C. if
D. as
98. If you can not get to sleep, then get up and try to do something ____ lying in bed.
A. and
B. or
C. instead of
D. because of