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改错:(1)Tom went to school by bus on her own yesterday.(2)I have finished my homework just now.I can go climbing the hill with you.(3)Jack has bought this beautiful watch for three years.

题目详情
改错:(1)Tom went to school by bus on her own yesterday.
(2)I have finished my homework just now.I can go climbing the hill with you.
(3)Jack has bought this beautiful watch for three years.
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答案和解析
1)把her改成his,Tom是男生的名字.on her own是指靠他自己.如果要改成by的话,要改成by himself.所以可以有两种改法.
把On her own改成by himself或把her改成his都可以.
2)去掉have或者just now.just now是指一般过去时,但have是用于现在完成时.两种时态不可以共用.
3)bought为短暂动作,但既然带了三年,就是一个延续性动作,所以要改成kept或者had.