对片刻动作前时态的领悟
发生在明显的或具体的过去时间内的动作，应使用一般 过去时态，这是毫无疑义的。然而在 一些现实的语言环境里，描写相对说话时间只是片刻之前，有时短暂到令人无法察觉的过去 时间内发生的动作，也应使用一般过去时态。这却是很容易被忽略的。
历年高考命题对这种语言现象的考查似乎“情有独钟”。
(1)—Hello! I _______ you _______ in London. How long have you been here?(MET1988)
A. don't know；were B. hadn't known；are
C. haven't known；are D. didn't know；were (D)
(2)—Come on, Peter. I want to show you something.
—Oh, how nice of you! I _______ you _______ to bring me a gift.(MET1990)?
A. never think；are going B. never thought；were going
C. didn't think；were going D. hadn't thought；were going (B)
(3)—Your phone number again?
I _______ quite catch it. —It's 9586442.(NMET1995)
A. didn'tB. couldn'tC. don't D. can't (A)
(4)—Oh, it's you. I _______ you.
—I've just had my hair cut, and I'm wearing my glasses.(1996上海)
A. didn't recognize B. hadn't recognized
C haven't recognized D. don't recognize (A)
(5)—Hey, look where you are going!
—Oh, I'm terribly sorry._______. (NMET1999)
A. I'm not noticing B.I wasn't noticing
C. I haven't noticed D. I don't notice (B)
此类题大多提供的是描写现在的语境，相搭配使用的是动作发生在过去而对说话时似乎 仍有影响的心理感受动词，如know, think, expect, realize, notice等，因而很多考生错误地 使用一般现在时或现在完成时。
其实，新教材中好几处出现过这种语言现象。如：
(6)“I didn't know you were coming,” said one.(SB B p42)
(7)I'm sorry. I didn't know you wanted it. What a shame!(SBⅡA p 31)
(8)—Look at that sign. It (Smoking) is not allowed.
—Oh, dear. I didn't see it.(SBⅡA p78)
下面再选摘两道常见习题，供大家体会。
(9)I _______ the time _______ so quickly.
A. didn't realize; had passed B. don't realize; passed
C. haven't realized; passed D. haven't realized; had passed (A)
(10)—You've agreed to go, so why aren't you getting ready?
—But I _______ that you _______ me to start at once.
A. don't realize; want B. haven't realized; want
C. won't realize; will want D. didn't realize; wanted (D)
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