Lesson 7 Too late 为时太晚学习目标全解必记单词detective n. 侦探airport n. 机场expect v. 期待，等待valuable adj. 贵重的parcel n. 包裹diamond n. 钻石steal v. 偷main adj. 主要的airfield n. 飞机起落的场地guard n. 警戒，守卫precious adj. 珍贵的stone n. 石子sand n. 沙子常考短语be too ⋯to ⋯ 太而不能detective story 侦探小说at the airport 在机场on the airfield 在停机坪上I think so. 我认为是这样。I expect so.我希望如此［口语］expect sb. to do sth. 期待某人做某事wait for sth./sb. 动作上的等待keep guard 守望，警戒= stand guard to their surprise 使他们吃惊的是be full of 充满= be filled with 经典句型1.They were expecting a valuable parcel of diamonds from South Africa. 2. Thieves would try to steal the diamonds. 3. Two men took the parcel off the plane and carried it into the Customs House. 4. To their surprise, the precious parcel was full of stones and sand! 重点语法过去进行时过去进行时的构成： be 的过去式 +现在分词过去进行时和一般过去时经常同在一个句子里使用。过去进行时表示过去正在进行的动作或情况，一般过去时则表示比较短暂的动作或事件。正在进行中的动作或情况往往由连词when，while，as，just as 等引导。when，while 当⋯⋯时候（强调动作同时发生）while+从句 , 动词一定是延续性动词when+延续性动词 /瞬间动词while 能用 when 代替 ______，但是 when 却不一定能用while 代替。 while 通常只引导持续时间较长的动作，并且主句和从句可以同时用过去进行时，而when 和 as一般不这么用。John was watching TV while his wife was talking with a neighbour over the phone. Just as I was leaving the house, you came in. when 也可以引导比较短暂的动作， while 和 as则一般不行。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? ...
