| A．He is a teacher. |
| B．He is handsome. |
| C．He is telling a story. |
| A．Yang Ming is watching them. |
| B．Mary is watching them. |
| C．Yang Ming and Mary are watching them. |
| A．You are singing. |
| B．I am singing. |
| C．He is singing. |
| A．Wow! What a beautiful song! |
| B．I don’t know. |
| C．I’m sorry. |
| A．I am wearing a hat. |
| B．He is wearing a hat. |
| C．He want to wear a hat. |
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