题目内容
17．Mary has written a letter to her friend．（改为否定句）Mary hasn't written a letter to her friend．
分析 Mary已经给她的朋友写了一封信了．
Mary还没有给她的朋友写一封信．
解答 答案：Mary hasn't written a letter to her friend
含有助动词的肯定句改为否定句只需在助动词后加not即可，此题中的has是助动词，构成现在完成时，直接在has后加上not即可，has not可缩写为hasn't．
点评 考查对否定句构成的掌握，含有助动词的肯定句在变为否定句的时候直接在助动词后加上not即可．
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A、work in the mountains of Idaho
B、help children who have trouble reading．
C、help build good，low-cost houses．
52、Alice isyearC（s） older than Tina．
A、1
B、2
C、3
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A、get a lot of money
B、get a great workout
C、breathe the mountain air
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A、Reading for Life
B、the Green Plan
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A、Many teenagers help others for free．
B、It's true that teenagers today are selfish．
C、Jason can learn new skills by volunteering．
