[典例剖析] 单项选择。
( )Mike ______ draw when he was five, but now he ______ draw well.
A.couldn't; can't
B.can't; can
C.couldn't; can
( )Mike ______ draw when he was five, but now he ______ draw well.
A.couldn't; can't
B.can't; can
C.couldn't; can
答案
【解析】：本题考查时态的运用以及转折连词的理解。题干中提到了“when he was five”，明确指出了过去的时间点，因此前半句应该使用一般过去时，表示过去的能力或状态。后半句中出现了转折连词“but”，表示前后两个句子的意思是相对的，即过去不会但现在会。根据这两个关键点，我们可以排除选项B，因为B选项中的“can't”和“can”都是现在时，不符合前半句的一般过去时要求。而A选项中的“couldn't; can't”虽然前半句符合时态要求，但后半句的“can't”表示现在也不会，与题意不符。因此，正确答案是C，“couldn't; can”，表示过去不会但现在会。
【答案】：C
【答案】：C
[反馈练习] 按要求完成句子。
1. The boys didn't ride bikes in the park on Saturday afternoon. (改为肯定句)
The boys ______ bikes in the park on Saturday afternoon.
2. Paul is good at playing football now. (用 last year 替换 now 改写句子, 并将句子改为否定句)
Paul ______ good at ______ football last year.
3. We played games and watered flowers on that day. (改为否定句)
We ______ ______ games ______ ______ flowers on that day.
4. Little Ben bought some fruit for his grandma in the supermarket. (改为否定句)
Little Ben ______ ______ ______ fruit for his grandma in the supermarket.
1. The boys didn't ride bikes in the park on Saturday afternoon. (改为肯定句)
The boys ______ bikes in the park on Saturday afternoon.
2. Paul is good at playing football now. (用 last year 替换 now 改写句子, 并将句子改为否定句)
Paul ______ good at ______ football last year.
3. We played games and watered flowers on that day. (改为否定句)
We ______ ______ games ______ ______ flowers on that day.
4. Little Ben bought some fruit for his grandma in the supermarket. (改为否定句)
Little Ben ______ ______ ______ fruit for his grandma in the supermarket.
答案
1. rode 2. wasn’t，playing 3. didn’t play，or water 4. didn’t buy any
