Unit 12 Life is full of the unexpected.
The First Period Section A 1a-2c

【Teaching aims】
一、听、说、读、写以下词汇及词组：backpack, oversleep, give a lift
二、通过学习，口、笔头掌握下列句型：
1. By the time she got up, her brother had already gotten in the shower. 版权所有
2. By the time she went outside, the bus had already left.【版权所有：】
3. By the time she got to the class, the teacher had already started teaching.
4. By the time I got back to school, the bell had rung.名师原创作品
5. When she got back to school, she realized she had left her backpack at home.
三、学会使用过去完成时态，叙述过去发生的事情。
四、增强做事的计划性，学会合理安排时间。
Difficulties（难点）：学会使用过去完成时态，叙述过去发生的事情。           
【Teaching steps】
 Before listening
Warm-up and revision（课堂热身和复习）
1. 你能写出下列单词的过去时和过去分词吗？
ring ________ _______                        get _________ ________  
go ________ _________                       leave ________ ______
start _______ ______                         have _________ ________
break ______ ______                         run ______ ____