The man began to work four hours ago．（改为同义句）
The man has________ ________four hours．
They have been away from here since two years ago．（改为同义句）
________ ________two years________they left here．
They started to play the piano one or two hours ago．（改为同义句）
They started to play the piano________ ________ ________two ago．
We started to skate two hours ago．（对画线部分提问）
________ ________you start to skate？
He ran in the school for half an hour．（对画线部分提问）
________ ________ ________he run in the school？
I________English for about six years．
A．learn
B．am learning
C．have learned
D．will learn
