老师：hello， everyone welcome to miss lus English class today， we are going to deal with unit three the world of size lesson， two using language focusing on the present perfect passive 现在完成时被动语态。
老师：please get your textbook， notebook and pen already before we start lets make a clear of learning objectives at the end of this lesson， you will be able to first sum up the structure and usage of the present perfect passive through discovering， analyzing im comparing。
老师：通过发现分析和比较等方法，总结现在完成时被动语态的结构和用法。
老师：Can't change sentences from the present perfect active into the present, perfect passive in the passage.
老师：能够将语篇中的现在完成时主动语态变成现在完成时被动语态。
老师：finally try to use the present perfect passive in different contacts properly。
老师：尝试在不同语境中正确运用现在完成时被动语态。
老师：And the No. 2 and No. 3 are also the learning focus of this class. Now let's come to part one, revision, the new age of invention. Please turn to page 26. In this passage, invention is a keyword, which is throughout the interview. And advance is also a keyword to stress the importance of the inventions. Please read paragraph 4 to find out the. sentences containing invention。 And paragraph 12 to find out the sentences containing advance, then please read the sentences and have a better understanding of these two words. Okay, please go. Time is up. Let's read these sentences together.
老师：Number one, there have been golden ages of invention throughout history. Number two, think of the four great inventions in ancient China, a gunpowder, paper making, printing, and the compass. Number three, then there was a great western inventions, the steam engine, the telephone, and the radio. So what does the word invention really mean? Yes, invention here means a creation, a new device, or progress resulting from study and experimentation. It is similar in meaning to innovation, except for that we can also see that inventions originated from ancient time, no matter in ancient China, all in western countries, and now it also develops.
老师：How do you know? Because here the interviewee use have been the present perfect in the sentence to express a period of time. The present perfect, chengshi. It describes an action which takes place in the past and continues to the present.
老师：Let's go on reading. Now. Reduced energy supplies and environmental pollution have led to more advances in the technology of new energy vehicles. And also, what does the word advance really mean? Yes, advance here means a forward movement, progress or improvement in importance, rank, etc. It is similar in meaning to progress, except for that we can also see that the inventions have made influence on our lives.
老师：How do you know? Because it uses have led advances here have led. It is also the present perfect here. It describes an actio
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