2.I saw the worker sawing the log with the saw.
3.The builders are building a high building now.
4.An orange is orange.
5.A dead fly can't fly.
6.Practice makes perfect!
7.Pull yourself together.
8.Piece of cake.
9.Old chum.
请再来一位....他们回答的还是不怎么好..再来...我怕不对..