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＞＞＞英语语法经典例题800例集锦＜＜＜
1. I _____ his telephone number. I have his number, but I ____ to bring my phone book.
A. forget, forget B. forgot, forgot
C. forget, forgot D. forgot, forget
【陷阱】容易误选A，认为忘记是现在的事。
【分析】仔细体会一下对话的语境：第一个人说我忘记他的电话号码了，这个忘记应该是现在的情况，即现在忘记了，要不然就没有必要同对方说此话了，故第一空应填 forget;第二个人说我有他的号码，但我忘记带电话本了，这个忘记应该是过去的情况，即过去忘记带电话本，所以现在电话本不在身上(注意句中的转折连词 but)，故第二空应填 forgot，即答案选应C。请再看一例：
Oh, I ______ where he lives.
Dont you carry your address book?
No, I ______ to bring it.
A. forget, forget B. forgot, forgot
C. forget, forgot D. forgot, forget
答案选C，理由同上。
2. I had hoped to see her off at the station, but I _____ too busy.
A. was B. had been
C. would be D. would have been
【陷阱】容易误选B或D，认为前句用了had hoped，所以此句谓语要用B或D与之呼应。
【分析】但正确答案为A，前一句谓语用had hoped，表示的是过去未曾实现的想法或打算，可以译为本想，而后一句说我太忙，这是陈述过去的一个事实，所以要用一般过去时。请做以下类似试题(答案均为A)：
(1) We had hoped to catch the 10:20 train, but _____ it was gone.
A. found B. had found
C. would find D. would have found
(2) We had hoped that you would be able to visit us, but you _____.
A. didnt B. hadnt
C. neednt D. would not have
(3) We had wanted to come to see him, but we ____ no time.
A. had B. had had
C. would have D. would have had
(4) I had expected to come over to see you last night, but someone ______ and I couldnt get away.
A. called B. had called
C. would call D. would have called
(5) The traffic accident wouldnt have happened yesterday, but the driver _______ really careless.
A. was B. is
C. were D. had been
3. Dear me! Just _____ at the time! I _____ no idea it was so late.
A. look, have B. looking, had
C. look, had D. looking, have
【陷阱】此题容易误选D，认为第一空用现在分词表伴随，第二空填 have 的一般现在时，以保持与前面时态的一致性。
【分析】其实，此题应选C，第一空应填 look, 因为这是祈使句的谓语;第二空应填 had，因为前一句说看看时间吧，这一看当然知道了现在很迟的情形，不知道这么迟了显然应是过去的事，故应用一般过去时态，许多同学由于忽略这一隐含的语境而误选。
4. Your phone number again? I _____ quite catch it. Its 4331577
A. didnt B. couldnt
C. dont D. cant
【陷阱】此题容易误选C，认为此处要用一般现在时态，表示现在没听清对方的话。
【分析】其实，此题答案应选A，根据上文的语境请把你的电话号码再说一遍好吗?可知没听清对方的电话号码应是在说此话以前，故应用一般过去时态。请看以下类似试题：
(1) Mr Smith isnt coming tonight. But he _____.
A. promises B. promised
C. will promise D. had promised
答案选B，他答应(要来)应发生在过去。
(2) Hey, look where you are going! Oh, Im terribly sorry. _____.
A. Im not noticing B. I wasnt noticing
C. I havent noticed D. I dont notice
答案选B，我没注意是对方提醒之前的事，现经对方一提醒，当然注意到了。
(3) Oh its you ! I ________ you. Ive had my hair cut.
A. didnt realize B. havent realized
C. didnt recognize D. dont recognized
答案选C。没认出是你是说此话之前的事，说此话时显然已经认出了对方。
(4) Whats her new telephone number? Oh, I _____.
A. forget B. forgot
C. had forgotten D. am forgetting
此题应选A，从语境上看，忘记的时间应是现在，即指现在不记得了。
(5) Since youve agreed to go, why arent you getting ready? But I ______ that you would have me start at once.
A. dont realize B. didnt realize
C. hadnt realized D. havent realized
答案选B。没意识到是对方提醒之前的事。
(6) Its twelve oclock, I think I must be off now. Oh, really? I ______ it at all.
A. dont realize B. havent realized
C. didnt realize D. hadnt realized
答案选C。没意识到是在听到的话之前的事。
5. Mr Smith ______ a book about China last year but I dont know whether he has finished it.
A. has written B. wrote
C. had written D. was writing
【陷阱】容易误选B或C。
【分析】此题应选D，这是由 but I dont know whether he has finished it 这一句话的语境决定的，全句意为史密斯先生去年在写一本书，但我不知道他现在是否写完了。有的同学可能由于受 last year的影响而误选B。但若选B，则句子前半部分的意思则变为史密斯先生去年写了一本书，既然是写了，那么这与下文的但我不知道他现在是否写完了相矛盾。
6. He has changed a lot. He _______ not what he _______.
A. is, is B. was, was
C. is, was D. was, is
【陷阱】几个干扰项均有可能误选。
【分析】最佳答案选C，上文说他变化很大，即他现在不是过去的那个样子了，故第一空填is，第二空填 was(其实第二空也可用 used to be)。请看类例：
What place is it? Havent you found out we _____ back where we ______?
A. were, had been B. have been, are
C. are, were D. are, had been
答案选C，We are back where we were 的意思是我们(现在)又回到刚才来过的地方。
7. He is very busy. I dont know if he _____ or not tomorrow.
A. come B. comes
C. will come D. is coming
【陷阱】此题容易误选B。认为 if 引导的是条件状语从句，从句谓语要用一般现在时表示将来意义。
【分析】其实，此题答案应选C，句中if引导的不是条件状语从句(即if如果)，而是宾语从句(即if=是否)，句意为他很忙，我不知道明天他是否会来。请看以下类似试题：
(1) I dont know if she _____, but if she ____ I will let you know.
A. comes, comes B. will come, will come
C. comes, will come D. will come, comes
答案选 D，第一个 if 引导的是宾语从句，第二个 if 引导的是条件状语从句。
(2) When _____ he come? I dont know, but when he _____, Ill tell you.
A. does, comes B. will, will come
C. does, will come D. will, comes
答案选 D，第一个 when 疑问副词，用于引出一个特殊疑问句;第二个 when是从属连词，用于引导时间状语从句。
(3) When he _____ is not known yet. But when he ____, he will be warmly welcomed.
A. comes, comes B. will come, will come
C. comes, will come D. will come, comes
答案选 D，第一个 when 引导的是主语从句，第二个 when引导的是时间状语从句。
8. The bridge, which _____ 1688, needs repairing.
A. is dated from B. was dated from
C. dates from D. dated from
【陷阱】此题容易误选B或D，认为句中用了 1688 这个过去时间，所以应选过去时态，又因为 date from 不用于被动语态，所以只能选D。
【分析】其实此题的最佳答案应是C，因为 date from 的意思是自某时起存在至今(=have existed since)，它通常用于一般现在时，而不用过去时态(尽管其后接的总是表示过去的时间)。如：
The church dates from 1176. 这座教堂是六世纪建的。
The castle dates from the 14th century. 这座城堡是14世纪建的。
但若所谈论的东西现在已不复存在，则可用一般过去时。如：
The church, which dated from the 13th century, was destroyed in an earthquake two years ago. 那座教堂是13世纪建成的，两年前在一次地震中被毁了。
注：与 date from 同义的 date back to 也有类似用法。
9. Youve left the light on. Oh, so I have. _____ and turn it off.
A. Ill go B. Ive gone
C. I go D. Im going
【陷阱】容易误选D。
【分析】A和D两者均可表示将来，填入空格处似乎都可以。但实际上只有A是最佳的，因为根据上下文的语境来看，我去把灯关掉这一行为是说话人听了对方的话后临时想到的，而不是事先准备的。而按英语习惯：will 和 be going to后接动词原形均可表示意图，但意图有强弱之分，如果是事先考虑过的意图，要用 be going to;如果不是事先考虑过的，而是说话时刻才临时想到的意图，则用 will。比较：
Ive come out without any money. Never mind, I will lend you some. 我出来没带钱。没关系，我借给你。(句中用will lend，表示借钱给对方是临时想到的，即听了对方的话后临时作出的反应)
Ive bought a typewriter and Im going to learn to type. 我买了台打字机，我想学打字。(句中用 be going to learn to type，表示说话人要学打字是事先准备的，并为此买了台打字机)