老师：Welcome back, boys and girls. Today we're going to learn grammar. We'll go talk about passive voice in the simple present and past tenses. We have Learned several charities around the world in Unit 7. Do you still remember their names? Look at the logo carefully and tell me what charity they are. Logo one, right? It's office. And logo 2, exhaust fan. And logo three, right? SWF and lost the charity, it's UNICEF, by the way. Which charity helps people with eye problems, of course.
老师：Office. You see these students, these people are doing something to support the charity. Office, they are heading out the liftlets. What is Lifter? Leaflet. And hang out. Fin fa tissue, hand out, handout. And leaflet is a noun, Chuantan in shopping. Leaflet. Leaflet. So these guys are handing out the leaflet to let others know about Orbis and help support office. So leaflets are handed out to the public are handed out. This is the passive voice. Do you still remember what all these doctors do? As we know, there is a fly I Hospital. And on the plane, volume doctors, the operations and the playing is used as a training center. Local doctors and nurses are invited on board to learn about eye operations. During doctors Martha last visit, 150 patients were operated on. Sentence 1, this is active voice. Says 2, three, 4 are in the passive voice. Now we're going to talk more about passive voice. So do you know when to use a passive voice?
老师：Situation one, it is obvious who performs the action. For example, the playing is used as a training center, or none of the books was taken away. It is obvious who performs the action, so we'd better use passive voice.
老师：Situation two, we don't know, or we don't need to know who performs the action. For example, his eye problem was cured two months ago, or the toy is designed for children.
老师：We don't need to know who performs the action. Situation 3, the action is more important than the person who performs the action. Let's have a look at the examples. The lives of the patients with eye problems are improved.
老师：So in a word, we usually use passive voice in the following situations. Situation one, it is obvious who performs the action. Situation two, we don't know or we don't need to know who performs the action. Situation 3, the action is more important than the person who performs the action. Alright, we need to talk about how to form the passive voice. Today we're going to talk about the passive voice in the simple present tense and the simple past tense. In the simple present tense, we should use NR, ease plus down. ETA is a positive. And in simple past tense, we usually write wars.
老师：War plus done. And what about the negative sentence structure, in the simple present tense, we say and not, are not, or is not done. I
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