B.Show a photo of Yao Ming, too. When he was a child.

Q:As a small child,what could Yao Ming do? （学习单词as）（解释：在姚明小得时候，他能够做什么？）

He could walk.

He could see.

He could hear.

Q:As a small child,what couldn't Yao Ming do?

He couldn't play basketball.

He couldn't jump high.

He couldn't speak English.

（此处用幕布逐渐出示问题和答案）

can---could（领读） can't---couldn't（领读）

它们之间有什么关系（过去式）

齐读句型，观察could 后的动词特征。

Pairwork（教师先示范提问几位同学，小组活动时讲明要求）

T: Let's do a pairwork, two students a pair, one ask, one answer, start.

What could you do?

I could...

What couldn't you do?

I couldn't...

C.Use can,can't,could,couldn't, fill in the blanks.

（用刮奖区覆盖答案，学生边答老师可以刮开答案.）