句型转换 1.They have been talking for the whole three hours.（改成一般疑问句）
1.__ they__ __ for the whole three hours?
2.We played basketball three hours ago.（改为现在完成进行时）
We __ __ __ basketball __ __ __.
3.He has been writing .（对划线句子提问 “”是划线句子）
__ __ __ he been writing?
4.My mother has been teaching math here for twenty years.（用since改写）
My mother has been teaching math here __ __ __ __.
速度（今天内..）