[误] She sang when she walked along the dark street.
[正] She sang as she walked along the dark street.
[析] as用于句中时，其要点是强调两个动作的同时进行。这里用when虽然不能讲是语法上的错误，但则看不出来小女孩因独自走黑暗的街道因害怕而唱歌的心情。
[误] I finished my homework until twelve o'clock last night.
[正] I didn't finished my homework until twelve o'clock last night.
[正] I did my homework until twelve o'clock last night.
[析] until用在句中时其含义是某一动作一直持续到某时结束，那么句中的动词则一定要用持续性动词，如果要用瞬间，或截止性动词时一定要用否定句式。因截止性动作的否定式应看作是持续性的动作。如离开leave是瞬间动作，因一出门即为离开了，而不离开则是长时间的。
[误] I have studied English when I was twelve.
[正] I have studied English since I was twelve.
[析] since引出的时间状语从句是表达了一个时间点，而这个时间点是主句动作的启始点，所以主句一般要用完成时态。
[误] Because he didn't study hard, so he didn't pass the exam.
[正] He didn't pass the exam because he didn't study hard.
[析] because 与 so在英文中两者不能并用的，只能在句中用其一。
[误] He was such excited that he could not speak.
[正] He was so excited that he could not speak.
[析] so与such的用法可以分为四种情况，①用于单数可数名词之前，其格式是such+不定冠词+形容词+单数可数名词，如：It is such a beautiful book that every child likes it. 也可以用so, 其格式是so+形容词+不定冠词+单数可数名词，如：It was so beautiful a book that every child likes it. ②在不可数名词前或可数名词复数前这时只能用such, 如：It is such good weather that we want to swim. 又如：They are such good students that they can pass the exam easily. ③在few, little， much, many 这4个字前只能用so而不能用such, 如：I have so much money that I can buy everything I want. ④当that前只有形容词或副词时，这时只能用so, 如：She is so beautiful that every one likes her. He ran so fast that I couldn't keep up with him.
[误] He got up earlier this morning so as to that he could catch the first bus.
[正] He got up earlier this morning so as to catch the first bus.
[正] He got up so earlier that he could catch the first bus.
[析] so…that与so that的用法有相同之处，那就是其后接从句，而so as to 其后要接不定式，即动词原形。这样的词组还有：in order to。
[误] I want to buy same stamp that you have.
[正] I want to buy the same stamp as you have.
[析] the same…as (that)这是个固定用法，在same前的定冠词是不能少的。而the same…that意为"我要的就是那一个"。而the same…as为"要的是和……一样的东西"。
[误] Before I do not give you the answer, I'll ask you some questions.
[正] Before I give you the answer, I'll ask you some questions.
[析] 这种错误是由于受中文的影响。在中文中可以讲"我没给你答案前"。而英文用了before就不要再用否定句了。
(三) 例题解析
1 We bought Granny a present, ___ she didn't like it.
A. but B. and C. or D. so
[答案] A. [析] 由于句意的原因，应选择转折连词。
2 Run quickly, ___ we'll miss the early train.
A. and B. but C. so D. or
[答案] D. [析] or这里应译为：否则。
3 I'll give the book to him ___ he comes back.
A. since B. as soon as C. before D. until
[答案] B.
[析] as soon as 引出的时间状语从句应用一般现在时表示将来要发生的动作。
4 Don't cross the road ___ the light turns green.
A. when B. while C. until D. as
[答案] C.
[析] until应译为"直到……才"，因为前面的祈使句为否定句。又如：She did not go to bed until her mother came back. 应译为"直到她妈妈回来她才睡觉"。
5 Miss Gao has been a teacher ___ 1990.
A. before B. after C. since D. in
[答案] C.
[析] 因为主句为完成时，所以应用 since表示该动作的启始点。
6 - Which would you like better, tea ___ milk?
- Tea, please.
A. but B. and C. or D. with
[答案] C. [析] 在疑问句与否定句中应用or来表示一种选择。
7 We love spring ___ there's beautiful flowers every where.
A. though B. but C. or D. because
[答案] D. [析] 因为这里表示的是因果关系。
8 Please leave ___ 7∶00, then you'll be able to get ___ there earlier.
A. till, in B. from, / C. before, / D. behind, to
[答案] C. [析] before为在7∶00之前离开。
9 The teacher didn't begin the lesson ___ all the students stopped talking.
A. until B. after C. if D. because
[答案] A.
[析] 这句应译为"直到所有的学生都停止讲话老师才开始上课"。因begin为瞬间动词，所以应用否定句。
10 Betty didn't go to see the film yesterday ___ she was ill.
A. but B. until C. if D. because
[答案] D.
[析] 这里是表示因果关系，所以应用because。因为她病了所以未去看电影。
11 You must start right now, ___ you'll miss the train.
A. for B. and C. so D. or
[答案] D.
[析] or译为"否则"。本句句意为：你必须马上走了，否则要赶不上火车了。
12 ___ he is a child of six, he can read and write.
A. Whose B. If C. Though D. Because
[答案] C.
[析] 这种状语从句在英语中称为让步状语从句，应译为：虽然他才是个6岁的孩子，他却可以读书和写字。
13 I like fish, ___ chicken, ___ eggs.
A. and, and B. and, with C. /, and D. and, /
[答案] C.
[析] 在有若干个名词或动词出现时，每一个词之间只用逗号连接，只在最后两个词之间加and。如：The old man passed the street, went into a shop and bought some food。
14 Take this dictionary with you ___ you may use it in class.
A. when B. in order to C. but D. so that
[答案] D.
[析] so that应译为"为的是"。本句句义为：带上字典，为的是在上课时可能有用。而in order to 其后应接动词不定式，如：Take this dictionary with you in order to use it in class。
15 I hope ___ will be fine tomorrow.
A. it B. what C. whether D. when
[答案] A.
[析] hope后接的是宾语从句，而且宾语从句中少主语，应用it来代替天气。
16 ___ she was not well, I decided to go without her.
A. Though B. As C. When D. Because of
[答案] B.
[析] as这里应译为"由于"。全句意为：由于她不舒服，我决定不带她去了。而because of 其后不能接从句只能接宾语。如： Because of the heavy rain, we decided not to go。
17 My aunt bought me ___ many story books that I spent a lot of time them.
A. such…on B. such…in C. too…in D so…on
[答案] D.
[析] 因many前只能用so来修饰，所以只能选择D选项。而spend…on something 为在某事上花费时间或钱。如：She spent a lot of money on her clothes。
18 Mother was cooking ___ she ___ a knock at the door.
A. when, listen to B. while, listened to
C. while, heard D. when, heard
[答案] D.
[析] when在这里应译为：就在那时，那一刻，那一瞬间。
19 Speak slowly, ___ we can understand you.
A. and B. or C. if D. because
[答案] A.
[析] and这里是并列连词，应译为：请讲慢些这样我们就会明白你的意思。
20 You'll learn English well ___ you put your heart into it.
A. if B. so C. until D. or
[答案] A.
[析] 本句译为：如果你将心放在学习上，你就会将英语学好。这里的语法现象是从句中用一般现在时表示将来。
21 I won't let you in ___ you show me your pass.
A. until B. for C. since D. because
[答案] A.
22 She didn't go to school ___ she was ill.
A. why B. because C. where D. but
[答案] B.
