当小朋友迟到了，老师会说：
A．Good morning.
B. Come in, please.
C. Goodbye.
当你想知道这块橡皮是不是自己的，可以问：
A．Is this my rubber?
B. Is this your rubber?
C. This is my rubber.
那不是我的笔袋，应该说：
A. This isn’t my pencil case.
B. That’s isn’t my pencil case.
C. That isn’t my pencil case.
那是一个书包吗？不，它不是。应该说：
A. Is that a schoolbag?No, it isn’t.
B. Is this a schoolbag? No, it isn’t.
C. Is that a schoolbag? Yes, it is.
当询问面前的牛奶是不是对方的，可以说：
A. This is your milk.
B. Is this your milk?
C. Is that your milk?