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通过学习，学生能够区分并使用用was/wasn’t 、were / weren’t来谈论过去和现在变化。?
3、情感目标：通过对比培养学生善于发现的精神。
三、教学重、难点：?
重点：能在实际中运用一般过去时描述人或事物的特征与状态，比较现在和过去。?
难点：能准确的读出“wasn’t, ?weren’t”并能正确的运用。
四、教学过程?
Step?1?Warming-up（热身活动）
1.?Greetings?
2.?Sing?a?song?《I was fat.》
3.Review： Let’s practice the opposites words.( show the exercises.)
(1)、Fill the blank.
(2)、I say short, you say tall. (With the actions.)
Step 2, presentation
1、Look and say.（用形容词描述图片）
例如：(1). The elephant is big. But how about it in the past? It was small then. 教读 was
(2). Look，what are they? They are monkeys. They are very thin now. But look at the picture in the past. How about them ?They were fat then. 教读 were
2、Guessing: What are they talking about? (butterfly) Look, now it is beautiful. As a baby, was it beautiful then? Let’s watch a video. （蝴蝶变化）----Answer： No，it wasn’t. (教读wasn’t)
3、Let’s Learn Activity 1.
(1)、Watch and listen.
(2)、Listen and imitate.
(3)、Read together.
3、Look and say（Today I bring some pictures. Let’s find the changes together.）
1）出示图片（小朋友）tall、short T: Look at them，they are tall now. But (换图) they ________ short then. And they weren’t tall then .(教读 weren’t were not=weren’t)
2)出示图片（鞋子）clean、dirty T: what are they？（shoes）Wow, they are dirty.教读 dirty
But they weren’t dirty then. They were clean then. 教读 clean
4、找朋友 （分类： am is are isn’t aren’t 和 was wasn’t were weren’t）Now+ then
Step 3 text learning
1、Watch and listen
2、 Listen、 imitate and circle the words： was、wasn’t、 were、weren’t
3、Listen and fill.(听一听，填一填)