(2) “Hey, look where you are going!” “Oh, I’m terribly sorry. _____.”
A. I’m not noticing B. I wasn’t noticing
C. I haven’t noticed D. I don’t 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 it’s you ! I ________ you.” “I’ve had my hair cut.”
A. didn’t realize B. haven’t realized
C. didn’t recognize D. don’t 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) “What’s 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 you’ve agreed to go, why aren’t you getting ready?” “But I ______ that you would have me start at once.”
A. don’t realize B. didn’t realize
C. hadn’t realized D. haven’t realized
答案选B。“没意识到”是对方提醒之前的事。
(6) “It’s twelve o’clock, I think I must be off now.” “Oh, really? I ______ it at all.”
A. don’t realize B. haven’t realized
C. didn’t realize D. hadn’t 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
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 don’t know whether he has finished it 这一句话的语境决定的，全句意为“
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?” “Haven’t 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 don’t 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 don’t 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。