英语教案－Earthquakes－教学教案

英语教案－Earthquakes－教学教案 as强调“一边……一边……”或是“与……同时，侧重表示主句的动作同时发生。
　　when既可以表示时间地点也可以表示时间段。
　　while只表示时间段，不表示时间点。它后面必须是延续性的动词，而且多为进行时态。当从句的谓语的动词为延续性动词时三者都可以替换使用。
例如wWW.CHIneSeJy.COm中国 教育资源‰网：
　　When I got home, he was having supper. 我到家的时候，他正在吃晚饭。
　　I liked dancing when I was young. 我年轻时喜欢跳舞。
　　They talked as they walked. 他们边走边谈。
　　A thief broke in as / while / when I was sleeping.在我睡觉的时候小偷闯了进来。
　　While / When/ As we were still laughing, the teacher came in. 当我们仍还在大笑，老师进来了。
　　Strike the iron while it is hot. 趁热打铁。
　　8．A wide and busy road which was built like a bridge over another road fell into the one below,. Many people were killed in their cars, but a few lucky ones were not hurt.一座以立交桥车辆川流不息的马路塌陷到桥下面的路面上。很多人被压死在自己的车里，但是也有少数幸运的人没有受伤。
　　这两个句子中one(s)是代词，用来代替或是避免重复上文提到的名词。one只可替代可数名词，其复数形式为ones. 第一句中的one代替road，第二句中的ones代替people。
例如：
　　If the earthquake is a big one, a great part of the city will be destroyed. 如果那是个大地震的话，城市的大部分地区将要被毁掉。
　　I would like a pound of apples, the red ones. 我要一英镑苹果，红苹果。
　　He had no excuse for his being late, but he had to fine one. 他迟到找不着借口，但是他必须找一个。
　　If you dont like these cups, I have other ones. 要是你不喜欢这些杯子，我还有别的。
　　9.Third, you must make the houses as strong as possible. 第三，应该把房屋建的尽可能结实。
　　As…as possible是个固定搭配，中间可加形容词或副词，意思为“尽可能的…”。
例如：
　　He had his breakfast as quickly as possible. 他尽可能快的吃了早饭。
　　Please come as early as possible tomorrow. 明天请尽可能早来。
　　They keep the classroom as clean as possible.他们尽可能的保持教室清洁。
　　12.Weak buildings will fall down in an earthquake , but strong ones may stay up. 不结实的建筑物会在地震中倒塌，而结实的建筑物则可能安然无恙。
　　短语stay up 的意思是“挺立，站立，熬夜”等。
例如：
　　You must stay up in time of difficulty. 困难面前你必须要挺住。
　　He stayed up all night. 他通宵未睡。
　　He has been working for almost a whole day, but he can stay up. 他干了快一整天了，但是还是挺得住。
　　10.time表示倍数的用法
　　在此句中表示倍数，其前面的数词用基数词。常用的倍数表示法有以下几种：
　　1.A is three (four/ five….) times bigger (more/ longer/ higher….) than B. A 比B大（多/高/长…）三（四/五…）倍。
例如：
　　The new bridge is three times

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