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1、Lesson 21Lesson 21 Lesson 21Lesson 21 Listen and answer:.Beijing Entrance Exit danger 危险危险 lazy 懒惰的懒惰的 cage 笼子笼子 What does the sign say ? Why cant they take photos ? Can Danny give the bear any donuts ?Why ?Danger! Do not feed the animals !No Photos nWhat does the sign say ?nWhy cant they take photo
2、s ?nCan Danny give the bear any donuts ?Why ? 到了做某事的时间到了做某事的时间7、Its time to do sth. lHave you ever been to the zoo? 你曾经去过动物园吗？I have been to Beijing . (Im here now)have been to表示“去过某地”，现已返回原地have gone to表示“去了某地”或已经达到目的地，或在途中They have gone to the Great Wall. ( They are not here now)【即时练习】1我去过北京。2.他们已
3、经去了长城。They go through the entrance. 辨析：through, across与over “通过，穿过”。across 平面穿过 through 空间穿过 over 上方穿过 They walk the bridge. 他们走过那座桥。They walk the gate. 他们走过门口。The birds fly the town. 鸟儿飞过城市常用Dont 或 No 动名词（名词）Dont make a noise in class. No smoking ! No swimming !表示警告或提醒的警示语:Try to say them in Englis
4、h!Exercise vOn Saturday , its _ eleven oclock. vThe three children arrived at the zoo, they went _ the _. They saw a _ bear sleeping. Danny wanted to take _ of it. But Brian stopped her. He said photos would _the animals and can make them _. Then they saw a sign: _! No photos . They knew what they should do in the zoo. They visited all _ of animals. Its time to go home. They found the _ and went out. They had a very good day.Animals are our good friends. We should love and protect them. Protecting them is also protecting us human beings.What did you learn in this lesson?