3．You always (play)football after school.Why not go home and do your homework first?

　　4．Where have you been，Dad？We (look)for you everywhere.

　　5．Great changes (take)place in our city in the last 10 years.

　　【答案】　1.have been waiting；hasn't turned　2.has been listening；has made　3.have；been playing 4．have been looking　5.have taken

　　Ⅱ.单句改错

　　1．I have been looked for my lost book for three days，but I still haven't found it.

　　2．Tom worked in the company for ten years and he doesn't have the intention to leave.

　　3．You have been said for a year that you'll work hard.

　　4．It is the third time that you visited our school.

　　5．She has been read all the morning；she ought to have a rest.

　　【答案】　1.looked→looking　2.worked前加has　3.said→saying　4.you后加have　5.read→reading

　　如何写电子邮件

　　1．格式：电子邮件的格式与书信的格式大致相同，基本要素有称谓、正文、结束语及署名。

　　2．特点：电子邮件内容要简明扼要，紧扣邮件中心，写电子邮件时应按事情的重要性安排叙述的先后顺序。

3．语言特征：(1)内容要写得简明扼要、目的明确；(2)态度要诚恳，语气要委婉礼貌。