8. by mistake 错误地 如：

  I took the umbrella by mistake. 我不小心拿错了雨伞。

7. salty  adj. 咸的  salt  n. 盐

6. operate v.  operation n.

   1）operate sth.   operate the machine

   2)operate on sb.   operate on her

   3)operation  have an operation on 接受手术 in operation 运转着 操作中

    The machine is in operation.

5. 给某人某样东西

give sth. to sb.  如：I gave a pen to him. 我给他一支笔。

   give sb. sth.        I gave him a pen. 我给他一支笔。

4. be used for doing用来做… 如：

   Pens are used for writing.笔是用来写的 Pens aren’t used for eating. 笔不是用来吃的。

  be used to do sth. /be used to doing sth./be used as…/ be used by… /used to do sth.

3. invent v. 发明  inventor n. 发明家  invention n. 发明 inventive adj.

  The_________ has__________thousands of__________.He is _______________.

2. 本单元要掌握的句型 见课本P69 中的Grammar Focus

被动语态 English      is spoken   by many people.

 如：      Many people  speak  English.