Unit18 The United States of America知識點總復習教案

27. settlers made agreements with native american chiefs.  移民者和土著人頭領達成協議。(p. 47 第三段第5行)
  ▲agreement此處作可數名詞，意為“協議”，常與arrive，reach，keep，break，make，sign等動詞連用。如: ① the two countries signed an agreement on nuclear weapons.兩國簽訂了一項關于核武器的協議。② i'm sorry you couldn't arrive at an agreement. 很遺憾你們不能達成協議。③ many agreements have been made between the two countries. 兩國之間簽訂了很多協議。
【注】agreement可以后接不定式或從句表示agreement的內容作定語 ① we reached an agreement with them to cooperate fully at all time. 我們與他們達成在任何情況下都合作的協議。② the negotiators came to an agreement that all troops would be withdrawn. 談判者達成協議，撤出所有部隊。
【注】 agreement可用作不可數名詞，意為“意見(或目的等)”“一致”“同意”。如: ① the two sides failed to reach agreement. 雙方未能達成共識。② we are in agreement with their decision. 我們同意他們的決定。③ we are in full agreement with them on all points. 在所有方面我們和他們看法完全一致。④ there's little agreement as to what our policies should be. 關于我們該采取什么政策，意見很不一致。⑤ we have to get their agreement before we go ahead with the plan. 在進行這項計劃之前，我們必須得到他們的同意。
28. while early settlers had killed bison for food, … 早期的移民宰殺野牛是為了充饑… (p.47 integrating skills reading 第四段 第2行)
* while conj. 在……的同時，當……的時候
  (1) while與延續性動詞連用，而when既可與延續性動詞也可與終止性動詞連用。
(2) 表示一個人的兩個動作交替或同時進行時，多用as表示“一邊……，一邊……”；when很少用于這種情況。
(3) 當表示兩個同步發展的情況時，多用as而不用when或while。
(4) 當表示兩個短促行為或事件幾乎同時發生時，用as要多于用when。
(5) while用作并列連詞，連接一個并列句，意為“而，卻”，表示前后意義上的對比和轉折。
while he was reading，he fell asleep. 他在讀書的時候睡著了。he came while we were having dinner. 我們在吃晚飯時他來了。when he came, we were having supper. 他來時，我們正吃晚飯。(不能用while) when / while i was sleeping, a thief broke in我睡覺時，小偷撬門而入。    he looked behind from time to time as he went. 他一邊走，一邊不時地向后看。she dances as she sings. 她一邊唱歌，一邊跳舞。as time went on / by, she became more and more worried. 隨著時間的推移，她變得越來越煩躁不安。as children get older，they are getting more and more interested in things about them. 隨著孩子們年齡的增長，他們對周圍的事物越來越感興趣。 just as he caught the flying worm, he gave a loud cry. 他剛抓住那只飛蟲，就大聲地叫了起來。i thought of it just as you opened your mouth.我剛想起，你就開口說了出來。 some people are rich while others are poor. 有些人富，有些人窮。i'm interested in sports while my brother is fond of music.我對體育很感興趣，而我的弟弟愛好音樂。