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Son::
Mum,two of my classmates have sisters. 
妈妈，我的两个同学有姐妹。
Mother::
Oh?What do they do?
哦？他们是干什么的？
Son::
The sister of one classmate is an actor.
其中一个同学的姐姐是一位男演员。
Mother::
You should say his sister is an actress.
你因该说他的姐姐是一位女演员。
Son::
I see.
哦，我明白了。
Mother::
And how about the other classmate's sister?
哦，另一个同学的姐姐是干吗的？
Son::
En....She is a drivess.
嗯，她是位司机。
Mother::
You should say she is a woman driver.
你应该说是位女司机。
son::
That's strange.
这真奇怪。
Mother::
You'll soon learn to say the right thing.
你将很快就学会事物的正确表达拉。