1.了解现在完成时的被动语态在具体语境中的运用。
2.掌握现在完成时被动语态的结构和主要用法。
3.使用现在完成时被动语态需要注意的问题。
Step 1 感受新知
Ⅰ.Find and read the following sentences in your text and pay attention to the underlined parts.
1.Over time I have been changed quite a lot.
2....,I have been used in offices and homes since the 1970s.
3....I never forget anything I have been told!
4.Since the 1970s,many new applications have been found for me.
5.I have also been put into robots and used to make mobile phones as well as help with medical operations.
