? [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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