1. 时间：由When, before,after,as,while,as soon as ,since,not-----until ,whenever等连词引导。
Eg:As he explored the rown,he took a lot of pictures. As soon as he arrived in france ,he called me . He has been in Shanghai sincehe was born. Don’t come in until you are called.
Whenever I’mfeeling down ,my frends will cheer me up. While I was watching TV,the bell rang . 2 . 原因：由because, as since等连词引导
Eg:I didn’tgo surfing because it was too cold . Asthe car was expensive ,we didn’t buy it . Since he was busy ,he didn’t come 3.条件：由if ,unless 等连词引导。
Eg:If you travel in India,you can use English everwhere. I won’t pass the exam unless I study hard . 4.比较：由as(so)---as,than 等引导。
Eg:The Yangtze River is almost as long as the Amazon River. John swims better than Jim (does)
5.结果：由so---that 引导。
Eg:He was so weak that he couldn’t walk on. 6.目的：由so, so that等引导。
Eg:We’re sit near the frnt so we can hear the speaker better. You should talk to him so that you can say you’re sorry. 7.让步:由Although，even thhough等引导
Eg: Although the traffic was heavy ,we got to the railway station on time . Even though he is 80,he still looks strong and healthy.
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