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3. To enable the students to understand and use the sentences anywhere.：Then I could ... /Now I can ...
Aims on the emotion
1.To help students cultivate and foster their ability of working in groups.
2.To help ss’cultivate their ability to solve problems independently.
二． Key points and difficult points：
1.To help ss ask and answer the questions：Then I could ..../Now I can ....
2.To enable ss to study in groups and co-operate skillfully.
3.To develop ss interest in English.
三．Teaching methods：
In this lesson I"ll mainly use “Task-based”teaching method , CAI teaching method ,group work. and mind map.
四．Teaching steps and purpose of my designing
Let’s focus on the teaching steps.I’ll finish the lesson in ---steps.
Step1.warming up
Free talk
Introduce myself（学生提问的方式）
Now：name/colour/animal/hobby(学生总结)
Twenty years ago: What could I do?(自主先学，展开想象)
T: But twenty years ago,what could I do?
S: You could ...
(目的：It is important to form a better English learning for the ss by thinking and at the same time it provides situations to learn knowledge for the next step.)
Step2. Presentation and practice
Now I’ll mainly talk about this step.
1. Show the mind map(思维导图)
Twenty years ago & Now
T: Ok.boys and girls.Look here.(你能用一个单词来表达它们的关系吗？)
Ss: change(引出change)
2. Teach “change”
3. Emotion teaching
T: We should know Everything changes.(情感教育)
Then and now（检测反馈）