精简一下英语短文（七年级）！！！

Mark Twain was an American writer. One day he went to a city by train. He wanted to see one of his friends there. He was a very busy man. He usually forgot something.
When he was in the train, the conductor asked him for his ticket. Mark Twain looked for the ticket here and there, but he couldn't find it. The conductor knew Mark Twain. She said, "Show me your ticket on your way back. And if you can't find it, it doesn't matter."
"Oh, but it does."said Mark Twain. "I must find the ticket. If I can't find it, how can I know where I'm going?"
帮忙把较难懂的语法结构变简单点，使原意不变，改正里面的语法错误。七年级水平，控制在100词之内，再译出汉语。
要是好再加分，多谢了！！！
译出汉语！！！

这是一个很初级的原版，你弄的那个基本上没啥错误，但有一点需要注意，"Oh, but it does."does后面一定要用逗号。
还有那位兄台把conductor翻译为列车长很不合适。

Mark Twain（马克·吐温）was an American writer（作家）. One day he went to a city by train. He wanted to see one of his friends there. He was a very busy man. He usually forgot something.

When he was in the train, the conductor（列车员） asked him for his ticket. Mark Twain looked for the ticket here and there, but he couldn't find it. The conductor knew Mark Twain. She said,“Show me your ticket on your way back. And if （如果）you can't find it,it doesn't matter.”

“Oh, but it does,”said Mark Twain.“I must find the ticket. If I can't find it, how can I know where I'm going?”

其中一些七年级不很熟的词汇
American 美国
went go的过去式
city 城市
usually 经常
forget 忘记
conductor 列车员
knew know的过去式，认识、知道
matter 事情、问题
could can的过去式