下列句子中各有一处错误，找出并改正。
1 I have bought the piano for six years.
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2—Where have you gone？—I’ve goneto school.
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3 How many pages have you read by the end of last year ?
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4 While I walked in the street, I saw my teacher.
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5 They have hadtheirlunchat twelve.
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6 The workers have repaired the machines just now.
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7 You have waited here since two hours.
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根据提示完成句子
1 玛丽害怕老虎。 Mary______ ___ tigers.
2迈克问我是否完成了家庭作业。 Mike asked me___ I my homework.
3他们完成工作以后停下来休息。 After they had ___the work ,they _______ __ a rest.
4遍地长满绿草。 The green geass grew___ ___.
5你对放风筝感兴趣吗？Areyou _______ ___ kites?
1.I have had the piano for six years。用持续性动词，bought不行2.I’ve been to school。我去学校了，而现在已经回来了。have gone说明人还在学校，那又怎么和你对话？所以不能用have gone3. How many pages had you read by the end of last year ?by the end of last year 是去年的末尾，显然用过去完成时 had..read4.When I walked in the street, I saw my teacher.5.They hadtheirlunchat twelve。
