2．We don't need (get)into an argument over this.

　　3．You needn't (tell)him the news.He had already known it.

　　4．The boy can't (finish)reading the book so soon because it is difficult even for an adult.

　　5．You might (refuse)her at the beginning，but now it is too late.

　　【答案】　1.watering/to be watered　2.to get 3．have told　4.have finished　5.have refused

　　Ⅱ.单句改错

　　1．We need buy tickets in advance.

　　2．The floor needs clean right now.

　　3．You needn't worked that late last night，which was harmful to your health.

　　4．It mustn't have rained last night，for the ground is dry now.

　　5．You needn't to go to the bank this morning.

　　【答案】　1.need后加to　2.clean→cleaning

　　3．needn't后加have　4.mustn't→can't/couldn't

　　5．去掉第一个to

　　如何写提供建议的电子邮件

　　1．概念：提供建议的电子邮件和书信一样，有称谓、正文和结尾署名。发件人在邮件中要向收件人提出建议和忠告。

　　2．分类：

(1)写给个人，就其遇到的某个问题提出自己的建议和看法。