6. 一般过去时和过去进行时

  比较下列句子:

 * I wrote a letter yesterday. (信写完了)

* I was writing a letter yesterday. (一直在写信,但不一定写完了)

* I was writing a letter when he came in. (他进来时,我正在写)

  从以上例句可以看出,一般过去时常常用来表示过去的一个有结果的动作,而过去进行时1)强调动作在某一时刻正在发生2)动作在过去一段时间内一直在发生,无论哪一种情况都不强调动作的结果。再如:

*He ______ a book about China last year, but I don’t know if he ______ it.

wrote; has finished    B. was writing; has finished

C. was writing; had finished  D. wrote; will finish

正确选项为B. 从I don’t know if he has finished it. 推断,他去年正在写。

* Tom ­________ into the house when no one ___________.

  A. slipped; was noticing     B. had slipped; noticed

  C. slipped; had noticed      D. was slipping; noticed

  正确选项为A. slip和notice 为同时发生的动作,因此B、C为错误选项,slipped指过去有结果的动作(他溜进去了),when no one was noticing 指他溜进去的一刹那发生的情况(没有人注意)。

* As she ________ the newspaper, Granny _________ asleep.

  A. read; was falling     B. was reading; fell 

was reading; was falling  D. read; fell

正确选项为B(道理同上)。

* The last time I _________ Jane she __________ cotton in the fields.

  A. had seen; was picking    B. saw; picked 

C. had seen; picked      D. saw; was picking

正确选项为D(道理同上)。

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