Unit12 Life is full of the unexpected.

　　【重点短语】

　　1. take a shower 淋浴

　　2. leave my backpack at home 把背包忘在家里

　　3. get back to school 返回学校

　　4. start teaching 开始教学

　　5. go off 响铃

　　6. rush out the door 冲出房门

　　7. give sb a lift 捎某人一程

　　8. miss both events 错过两个事件

　　9. be about to do sth 正要做某事

　　10. stare in disbelief at 难以置信地盯着

　　11. raise above the burning building 从正在燃烧的楼上升起

　　12. jump out of bed 跳下床

　　13. collect the math homework 收数学作业

　　14. show up 赶到，出现

　　【重点句型】

　　1. By the time I got up, my brother had already gotten in the shower. 当我起床时，我哥哥已经进了浴室了。

　　2. By the time I got outside, the bus had already gone. 当我出来时，公汽已经走了。

　　3. When I got to school, I realized I had left my backpack at home. 当我到达学校时，我才意识到我把背包忘在家里了。

　　4. By the time I walked into class, the teacher had started teaching already. 当我走进教室时，老师已经开始讲课了。

　　5. By the time I arrived at the party, everyone else had already showed up. 当我到达晚会时， 其他的每个人都已经到了。

　　6. When he put the noodles into the bowl, he realized he had forgotten to add the green beans. 当他把面条放进碗里时，他意识到他忘了添加绿豆荚了。

　　7. Before she got a chance to say goodbye, he had gone into the building. 在她得到一个向他告别的机会之前，他已经进入楼房了。

　　【考点详解】

　　1. By the time I got outside, the bus had already left. 当我出来的时候，公共汽车已经走了。

　　by the time作连词引导时间状语从句，当从句用一般过去时，主句用过去完成时;当从句用一般现在时，主句用一般将来时或将来完成时。

　　如：By the time he was ten, Tom had built a chemistry lab himself. 等到了十岁的时候，汤姆自己建了一个化学实验室。

　　I’ll be in bed by the time you get home. 你到家时，我已经上床睡觉了。

　　2. When she got to school, she realized she had left her backpack at home. 当她到学校时，她意识到她把背包忘在家里了。

　　表示“把某物忘在某处”要用词组leave sth in/on/at...

　　如： I've left my umbrella at home. 我把伞忘在家里了。

　　I left my book on the desk. 我把书忘在桌子上。

　　forget意为“遗忘某物”，指忘记一件具体的东西，但不能有具体的地点。

　　如：I forgot my umbrella yesterday. 我昨天忘了带伞。

　　Don't forget the cases. 别忘了带箱子。

　　3. Last Friday night, my friend invited me to his birthday party.

　　上周五晚上，我朋友邀请我参加他的生日晚会。

　　invite sb. to a place(或一活动、聚会) 意为“邀请某人到某一地方或参加某一活动”;而invite sb to do sth. 意为“邀请某人做某事”。

　　如： I think we have many friends now, and we must invite them to our place. 我想我们现在有很多朋友了， 我们也应该邀请他们到我们家做客。

　　Kitty’s teacher Mr Wu invited me to join their school trip to the World Park. 基蒂的老师吴老师邀请我参加了去世界公园的学校郊游活动。

　　4. Wells made it sound so real that hundreds of people believed the story and fear spread across the whole country.

　　威尔斯讲述这个新闻起来如此的真实，以致成百上千的人都相信了这个故事，进而引发了全国性的恐慌。

　　so…that...在此引导结果状语从句，so后面应加一个形容词或副词，意为“如此……以至于……”。

　　如：This book is so interesting that everyone in our class wants to read it. 这本书是如此的有趣以至于全班同学都想看看。(so+形容词)

　　He ran so fast that I couldn't catch up with him. 他跑得那么快，以至于我跟不上他。(so+副词)

　　【重点语法】

　　比较一般过去时和现在完成时的异同

　　1. 共同点：动作都是在过去完成。

　　I saw the film yesterday evening.

　　I have seen the film before.

　　(看电影这件事都是在过去完成的。)

　　2. 区别：

　　①现在完成时强调过去发生的动作对现在的影响和结果，而一般过去时与现在没有联系，只是说明某个动作发生的时间是在过去。

　　②一般过去时通常与具体明确的过去时间状语连用。如yesterday, last week , two years ago，just now，in 2002 等;而现在完成时则常与 just ,already ,ever ,never 等模糊的过去时间状语和 these days ,this week ,since..., for... 等表示一段时间的状语连用。