1·I have been skating for two hours （改为一般疑问句）
（have）you（ been ）（ skating ）for two hours？
2·He has been working since an hour ago.(改为否定句)
He （ hasn't）（ been ）（working ）since an hour ago
3·He ran for three hours。（对划线部分提问）
（ How ）（ long ）（ did ）he （ run ）
4·Jim got his favorite book on Children’s Day。（对划线部分提问）
（ when ）（did ）Jim （get ） his favorite book？
5·I have been collecting leaves for two years。（改为同义句）
I have been collecting leaves( since )(two )(years )(ago )
1 Have you been skating for two hours
2 He hasn't been working since an hour ago
3 4你没给线那
答案
1 Have you been skating for two hours
2 He hasn't been working since an hour ago
3 How long did he run (划线的估计是for three hours）
4 When did Jim get his favorite book（划线的估计是on Children’s Day）
5 I have been collecting leaves since two years ago
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