问题标题：
Theyhavebeencollectingshellsforthereyears.（改为同义句）HasTombeenskatingforhours?(做否定回答）Mymotherhasbeencollectingstampsforabouttenyears.(向画线句子提问）
问题描述：
Theyhavebeencollectingshellsforthereyears.（改为同义句）
HasTombeenskatingforhours?(做否定回答）
Mymotherhasbeencollectingstampsforabouttenyears.(向画线句子提问）
任伟回答：
1.Theyhavebeencollectingshellssincethreeyearsago.
2.No,hehasn't.
3.Whathasyourmotherbeencollectingforabouttenyears?
不明白的再问哟,请及时采纳,多谢!
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