Unforgettable experiences教案
unforgettable experiences教案unit 4 unforgettable experiences
第二課時學案
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 疑難透析
1. what had he been doing before the earthquake ?
過去完成進行時表示在過去一個時間點以前一直進行的動作; 而現在完成進行時則表示從過去一個時間點開始一直進行的動作。例如:
i had been doing my homework before you came .
i have been doing my homework since i came back home .
注意 完成進行時都是強調動作的延續, 故其中的動詞必須是延續性的。
考查方向 現在與過去進行完成時的辨異。
【典型考題】 北京高考
three months went by before she knew it . 她還沒有意識到三個月就過去了。
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 還在考慮這件事情, 故用現在完成進行時, 表示動作還在繼續。
【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 意為“還未來得及…就…”， 例如：
the telephone was hung up before i could answer it .
我還未來得及接電話, 電話就掛斷了。
before 還可以表示“… 之后才…”, 例如:
he almost knocked me down before he saw me .他幾乎把我撞倒才看到我。
before 還可用于 it was not long before …結構, 表示“不久以后”。在此句式中, it 表示時間, before 引起時間狀語從句。若從句時態為將來時, 應用現在時表示。例如:
it was not long before the whole country rose up and drove the enemy out of their homeland . 不久以后, 全國人民奮起反抗, 把敵人趕出了他們的國土。
注意 before 用法很多, 在平時的學習中應特別注意。它既可用作連詞又可用作介詞, 應注意不同詞性需要不同形式。
考查方向 before 與其他連詞的意義辨析以及詞義。