◎ <活动三> 在小组里分角色表演对话，完成课本2d。

Ⅲ、知识超市

★ on, under和in都是方位介词，它们都可以用在名词或代词前表方位。

　　介词on意为"在......上"，常指某物在另一物的表面上。（二者之间有接触）

　　介词under意为"在......下"， 常指某物在另一物的正下方。（二者之间没有接触）

　　介词in意为"在......里面"， 常指某物在某个空间内部。

思考：in除了表示"在......里面"，还有其他的含义吗？

★ --- Is the bag on your desk? --- No, it isn't. It's on the sofa.

句式结构：Be + 物品 + 表位置的介词短语。回答时用it代替单数名词。

思考：如果该句型的物品名词为复数时，be动词用什么形式？回答时用什么词代替该名词？

做一做：补全对话。

1. --- the bag on the table? --- Yes, is.

2. --- the keys on the table?

　 --- No, aren't. They under the sofa.

【导学测评】：

Ⅰ、选择适当的介词填空。

1. My English book is the schoolbag.

2. The TV is the table.

3. The baseball isn't on the sofa. It's the sofa.

4. What's this English?

5. This is a photo my family.

Ⅱ、单项选择。

（ ）6. --- Where is he key? --- It's .

A. under the table B. under table C. the table under D. table under

（ ）7. --- Where Lucy and Lily? --- in the bedroom.

A. is; She's B. is; They's C. are; They're D. are; They's

（ ）8.Jim and I in Classroom 2E.

A. am not B. isn't C. aren't D. don't

（ ）9. --- Are the keys in the schoolbag? --- Yes, are.

A. these B. they C. those D. it

【学习体会】

　　　　　　收获: 不足:

　　　　　Unit 4 第三课时 Section A (Grammar Focus ~ 3c)

【学习目标】