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Just as I was leaving the house, you came in. when也可引导较短暂的动作，while和as一般不行。 We were having supper when the lights went out. 过去进行时往往与表示一段时间的状语连用，如all morning，all night，all day，all evening，the whole week等，表示这段时间一直在干什么。
What were you doing all evening? I couldn‘t find you anywhere.
过去动作同时发生的时态
① 过去两个动作同时发生, 习惯上一个用一般过去时, 另一个用过去进行时；动作长用过去进行时, 动作短用一般过去时; 分工的情况, 动作的开始时间和结束时间几乎相同, 均用过去进行时; I was listening to the radio, my sister was dancing. When my mother was doing the housework, my father was watching TV.
② 两个动作在同时段进行, 在不同时间结束, 先发生的动作未结束, 另一个动作发生, 先发生的动作用进行时态, 另一个动作用过去时.
When I was opening the door, the telephone rang.先开门/When the telephone was ringing, I opened the door. 电话先响
③ 瞬间动词（如：arrive）没有进行时态, 所以两个动作同时发生, 延续性动词用进行时态, 瞬间动词使用过去时态.
When he arrived, I was having dinner. I am arriving 进行时态表示将要 【Special Difficulties】 短语动词中的小品词
许多动词加上介词或副词后就会改变词义，这些介词和副词通常被称为小品词。它们没有词形的变化。有些小品词既可以作介词又可以作副词。判断一个小品词是副词还是介词要看小品词有没有带宾语。有宾语的是介词，没有宾语的是副词，介词的位置相对固定，不能变动。 ① vi.&vt.+ prep./adv.+宾语(n.) She is walking up the hill. ② vt.+宾语(n./pron.)+adv.
take off the coat =take the coat off =take it off
put on your shoes =put your shoes on =put them on I always take money with me.我身上总带些钱 【Multiple choice questions】
9 The parcel was valuable. It was ___c___ . a. worth b. worthy c. precious d. value valuable= precious value n. 价值
worth v. 值得……，后面一定要加词
something is worth…
The book is worth reading. (动名词) The book is worth three dollars. worthy adj. 有价值的 be worthy of… 值得……
This book is worthy of being read [to be read]. acts worthy of punishment 应该受处分的行为 worthless adj. 无价值的
