1、Grammar【学习目标】1. 掌握 before; after; when 和 while 的基本用法。2. 掌握 since; till 和 until 的基本用法。 3. 掌握 as soon as 和 whenever 的基本用法【自主学习】1 仔细阅读 P54-56 语法部分。2.试做语法部分的练习。 3.写出下列单词的意思,并且熟记他们。生涯，职业 对抗，违反 【质疑拓展】1. before; after; when 和 while 都是用来引导时间状语从句的。时间状语从句是指在复合句中充当时间状语的句子。连词 before; after; when 和 while 引导时间状语从
2、句时，既可以放在句首，也可以放在句中。(1) before 引导时间状语从句时，意为“在之前” ，表示主句的动作发生在从句的动作之前。Close the window before you leave the room.(2)after 引导时间状语从句时，意为“在之后”，表示主句的动作发生在从句的动作之后。I went to school after I finished my breakfast.(3)when 引导时间状语从句时，意为“当( 在)时候”，表示主句动作发生的特定时间。The days get longer when spring comes.(4)while 引导时间状语从
3、句时，意为“在期间”，表示主句动作发生在从句动作经行的过程中。2. 我们也可以用连词 since; till 和 until 引导时间状语从句。(1)since 引导时间状语从句时，意为“自从以来” 。一般情况下，从句谓语动词用一般过去时，而主句的谓语动词用现在完成时。They have been friends since they were in primary school.(2)till 和 until 引导时间状语时，意为“到 为止”，一般情况下两者可以互换，但 until 可以放在句首或句中，而 till 通常放于句中。我们用 notuntil 结构时，不能用 till 替换 un
4、til.Walk until/till you see a white house.The children wont come home until it is dark.3. as soon as 和 whenever 也可以引导时间状语从句。(1)as soon as 引导时间状语从句，意为“一 就.”As soon as I got to the bus stop, the bus started.(2)whenever 引导时间状语从句，意为“每当，任何时候”You can ask for help whenever you need it.Questions:_【演练展示】1. _
5、 I got back, I found my mother cooking for me.A. When B. Before C. Since D. Although2. I will wait _ I hear from you.A. until B. since C. while D. because3. Ill go to visit my aunt in England _ the summer holidays start.A. while B. since C. until D. as soon as【当堂检测】1._ I am in trouble, my best frien
6、d Li Lei always helps me.A. Whenever B. Whatever C. However D. Never2. Helen didnt know anything about it _ her father told her.A. if B. because C. after D. until3. Youd better make a good plan _ you take a holiday.A. before B. during C. until D. after【评价反馈】个人得分 小组得分 自我评价（目标达成情况或记录还未掌握的内容）【课后作业】1. B
7、oys and girls, calm down and focus on the test paper _ you begin to think about the answers. Be confident. You can do it!A. as if B. as soon as C. although D. until2. Amy was reading a book _ I came in.A. when B. while C. because D. though3. My uncle has been taught in this school _ he was twenty-four years old.A. since B. for C. until D. after
