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2019-2020年八年级英语Unit 6 Natural disasters Period FiveTeaching Aims: To use because, as, and since to introduce the reason for something. Teaching Procedures: Step1. Free talk: 1. Why do you go to school? 2. What will happen to pandas, if farmers cut down trees and forests? 3. Why were you late this morning? 4. What will we do , if it rains? 5. What do you want to be when you grow up? 6. What do you usually do after class? Step2. Learn grammar A because, as, since 均表示“因为；由于” （1） because 语气最强，用来回答 why ，可表示已知或未知的事实。它可以和 only,justy 以及否定此 not 连用。 Because 引导的从句一般放在主句后面。如： I plan to do it because I like it._ Tom didnt attend the meeting because he was ill._ You shouldt get angry just because some people are not polite to you._ (2 )as, since 语气较弱，常放在主句前。 as 表示的原因比较明显 ; since 常表示对方已知的事实，相当于“既然” As all the seats were full. He had to stand there._ As it was snowy, it took me longer to get to school._ Since you ask, I will tell you._ Since youre not interested, I wont talk about it._ Step 3 Exercises: plete the sentences by adding the connectives of reason. 1.I left my umbrella at school. I was in a hurry. (because) 2.I went to bed early. I didnt watch the programme.(as) _ 3.I could not do my homework. It was too difficult.(since) _ 4 因为我妈妈生病了，我必需要照顾她 _ 5 由于下雨 , 我们不上体课 . 7. 既然你没时间 , 我就不说了 . Homework: 教后感
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