Unforgettable experiences教案

2018-06-02
unforgettable experiences教案
unit 4 unforgettable experiences
第二课时学案
teaching aims and demands :
some sentence patterns and difficult points of grammar .
important and difficult points :
attributive clauses , the past perfect continuous tense and the present participles .
teaching procedures :
step 1 疑难透析
1.      what had he been doing before the earthquake ?
过去完成进行时表示在过去一个时间点以前一直进行的动作; 而现在完成进行时则表示从过去一个时间点开始一直进行的动作。例如:
i had been doing my homework before you came .
i have been doing my homework since i came back home .
注意  完成进行时都是强调动作的延续, 故其中的动词必须是延续性的。
考查方向  现在与过去进行完成时的辨异。
【典型考题】                        北京高考
       three months went by before she knew it . 她还没有意识到三个月就过去了。
now that she is out of a job , lucy __________ going back to school , but she hasn’t decided yet .
a. had considered            b. has been considering
c. considered                d. is going to consider
【解析】由 she hasn’t decided yet 可知, lucy 还在考虑这件事情, 故用现在完成进行时, 表示动作还在继续。
【答案】b。
2.      before she could move , she heard a loud noise .
before she could think twice , the water was upon her .
本句中,before 意为“还未来得及…就…”, 例如:
the telephone was hung up before i could answer it .
我还未来得及接电话, 电话就挂断了。
        before 还可以表示“… 之后才…”, 例如:
        he almost knocked me down before he saw me .他几乎把我撞倒才看到我。
        before 还可用于 it was not long before …结构, 表示“不久以后”。在此句式中, it 表示时间, before 引起时间状语从句。若从句时态为将来时, 应用现在时表示。例如:
        it was not long before the whole country rose up and drove the enemy out of their homeland . 不久以后, 全国人民奋起反抗, 把敌人赶出了他们的国土。
        注意  before 用法很多, 在平时的学习中应特别注意。它既可用作连词又可用作介词, 应注意不同词性需要不同形式。
        考查方向  before 与其他连词的意义辨析以及词义。

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