例1: a watermelon | — What's this / that? — It's a watermelon. |
1. a pear | — ____________________________? — ____________________________. |
例2: a pencil | — Is this / that a pencil? — Yes, it is. |
2. a bag | — ____________________________? — ____________________________. |
例3:  a strawberry / a peach | — Is this / that a strawberry? — No, it isn't. It's a peach. |
3.  an orange / a lemon | — ____________________________? — ____________________________. |