八年級(jí)英語下冊(cè)Unit 3重點(diǎn)短語及句型總匯
4. 當(dāng)不明飛行物著陸時(shí)，你正在干啥？what were you doing when the ufo landed?
5. 當(dāng)媽媽正在做飯時(shí)，我在看電視。while my mother was cooking ,i was watching tv.
6. i was walking down the street when a ufo landed right in front of me.
7. you can image how strange it was.
8. i followed to see where it was going.
9. isn’t that amazing!
10. she didn’t thinking about looking outside the station.
11.i was so tired this morning. it was difficult to get out of the bed.
12.liu xiang won the gold medal at the olympics.
13.beijng was made host to the olympics.
14.people often remember what they were doing when they heard the news of important events in history.
15. this was one of the most important events in modern american history.
16.even the most everyday activities can seem important.
17.our teacher asked us to stop what we were doing and listen.
18.however, in more recent times, most americans remember what they were doing when the world trade center in new york was destroyed by terrorists.
19.not all events in history are as terrible as this, of course.
20. his flight around the earth lasted about 22 hours.
本單元語法講解
過去進(jìn)行時(shí)（past progressive tense）
句型 s + was/were +v-ing…
例a：she was doing her homework at 8:30 yesterday evening.
（昨天傍晚八點(diǎn)半她正在做家庭作業(yè)。）
例b：we were having supper at that time.
（那個(gè)時(shí)候我們正在吃晚飯。）
解說 如例1所示，在單句中使用過去進(jìn)行時(shí)來表達(dá)時(shí)必須把該動(dòng)作正在進(jìn)行中的時(shí)間表明清楚，否則就不合邏輯了。例如：i was taking a bath yesterday. （錯(cuò)）
（昨天我正在洗澡——昨天24小時(shí)都正在洗澡嗎？）
所以本句應(yīng)該如例1來表達(dá)，或者用一般過去時(shí)表達(dá)如下：
i took a bath yesterday.（昨天我洗了澡。）
如果由上下文的文意，或者對(duì)談中的話意可以了解“動(dòng)作正在進(jìn)行中的時(shí)間”，單句里就使用過去進(jìn)行時(shí)來表達(dá)是很普通的，例如：
a：i called you up yesterday evening.
b：did you? at what time?
a：at around ten o'clock. （大約在十點(diǎn)鐘。）
b：oh, i was taking a bath then.（哦，當(dāng)時(shí)我正在洗澡。）
過去進(jìn)行時(shí)在表達(dá)上常用的句式是如例2所示和另一個(gè)一般過去時(shí)的動(dòng)作相搭配。請(qǐng)觀察下面的圖解說明：
過去有二動(dòng)作a和b（如圖示），在b動(dòng)作發(fā)生時(shí)稍早發(fā)生的a動(dòng)作正好在進(jìn)行中，所以這種表達(dá)法通常都是復(fù)句（主句+副詞從句）。例如：
when i got up this morning, mother was preparing breakfast in the kitchen.
（今天早上我起床時(shí)媽媽正在廚房里準(zhǔn)備早餐。—“mother…。”是主句，“when…，”是副詞從句。）
常用于修飾過去進(jìn)行時(shí)的時(shí)間副詞：過去的某一定點(diǎn)時(shí)刻（at + 過去的時(shí)刻），then （= at that time）（那時(shí)，當(dāng)時(shí)），all + 時(shí)間，“when…/while…/as…”等副詞從句，etc.