知識總結(jié)：普通專升本英語時(shí)態(tài)之過去進(jìn)行時(shí)！

    過去進(jìn)行時(shí)
    1. 概念：表示過去某段時(shí)間或某一時(shí)刻正在發(fā)生或進(jìn)行的行為或動作。
    My brother fell while he was riding his bicycle and hurt himself.
    我兄弟騎車時(shí)摔了下來，受了傷。
    When I got to the top of the mountain, the sun was shining.
    我到達(dá)山頂時(shí)，陽光燦爛。
    2. 時(shí)間狀語：at this time yesterday, at that time或以when引導(dǎo)的謂語動詞是一般過去時(shí)的時(shí)間狀語等。
    3. 基本結(jié)構(gòu)：was/were+doing
    否定形式：was/were + not + doing.
    一般疑問句：把was或were放于句首。

    4. 用法
    1) 過去進(jìn)行時(shí)表示過去某段時(shí)間內(nèi)持續(xù)進(jìn)行的動作或者事情。
    We were watching TV from seven to nine last night.
    昨天晚上七點(diǎn)到九點(diǎn)的時(shí)候我們在看電視。      
    2) 過去進(jìn)行時(shí)可以表示在過去某個(gè)時(shí)間點(diǎn)發(fā)生的事情。
    時(shí)間點(diǎn)可以用介詞短語、副詞或從句來表示。
    What was she doing at nine o'clock yesterday?
    昨天晚上九點(diǎn)她在做什么？ (介詞短語表示時(shí)間點(diǎn))
    She was doing her homework then.
    那個(gè)時(shí)候她正在寫作業(yè)。（副詞表示時(shí)間點(diǎn)）
    When I saw him he was decorating his room.
    當(dāng)我看見他的時(shí)候他正在裝飾房間。 (when從句表示時(shí)間點(diǎn))
    3) 在復(fù)合句中，如果主要動作和背景動作都是延續(xù)的或同時(shí)發(fā)生的，那么主從句的動詞都可用過去進(jìn)行時(shí)。
    When he was waiting for the bus, he was reading a newspaper.
    他邊等車邊看報(bào)。 (兩個(gè)動作都是延續(xù)的)
    He was cleaning his car while I was cooking.
    他擦車時(shí)我在做飯。(兩個(gè)動作同時(shí)進(jìn)行)