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［误］ When I finished to do this work I would go to play football.
［正］ When I finished doing this work I would go to play football.
［析］ 在英语中有些动词后要接动名词作宾语。在初中范围主要有两个动词finish和enjoy, 千万不要与like相比。因为like作动词"喜欢"用时，其后接动名词表示习惯性动作，接不定式表示一次性特殊的动作，而would you like后面则一定要用不定式。
［误］ When he finished his homework, he went on playing the football.
［正］ When he finished his homework, he went on to play football.
［析］ go on to do something 是做完一件事紧跟着做另一件事。而go on doing something 是在做一件事的过程中被打断后接着再继续做这件事。
［误］ He's busy to prepare his lessons.
［正］ He's busy preparing his lessons.
［析］ be busy 后加doing 而不能接不定式。
(三) 例题解析
1 Mr Zhang asked me ＿＿＿ the words again.
A. read
B. reads
C. to read
D. reading
［答案］ C.
［析］ ask somebody to do something 要求某人作某事。
2 You ＿＿＿ play on the road. It's dangerous.
A. mustn't
B. may
C. can
D. must
［答案］ A.
［析］ must 用于否定句表示禁止做某事。
3 Mr Brown ＿＿＿ in Beijing since 1993.
A. work
B. works
C. worked
D. has worked
［答案］ D.
［析］ 句中有since引导的时间状语，因此句中要用完成时态。
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