1、Grammar (A、B),Unit 5 Art World,To learn to use because, since and as to give reasons.,Learning aims:(1),Guide one,Read the sentences on P70. Find out the usage of “because”2.Complete the exercises “questions about Tan Dun”,3. Conclusion: 1.because表理由或直接原因，语气强烈，因果关系明确！ 2.because 引导的从句多放居中，放句首要用逗号隔开.
2、3.不能出现because、so、,Guide Two,1. Read the following sentences and find out the usages of “ since and as”,_ its a program about manners and self-improvement, its worth watching. _ the hosts are humorous and funny, we like watching it very much. _ were busy with study, we can watch it to relax at weekends. _ the background music is beautiful, it attracts many musicians.,Since/As,Since/As,Since/As,Since/As,2. Conclusion: 1): since、as表达明显的或已知的理由，意为“既然”语气没有because强烈 2）since、as 既可放句首 也可放居中,
