learning important point: understand the difference between the first conditional and the second conditional
learning difficult point : learn to use the second conditional
learning steps :
step 1. 翻译下面的句子，然后思考总结：
(1) if our teacher agrees , we’ll talk about the topic .
(2) 如果明天天气好， 你要做什么？
(3) if people don’t stop polluting the air , animals and plants will soon die .
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