模拟一名警察讲诉遇到小偷的经历

Hello，everyone，today I want to tell you about my experience when was a policewoman and someday I catched a shopthief.
That was a cold night,and I was patrolling in the street as usual.Suddenly,I heard an alarm from a shop behind me.And I rushed to the shop immediately.I saw a man was stealing.Obviously,he had seen me at the same time.He was hasty and tried to run away.Luckily,it didn't cost much time for me to react.So,I overtoook him at once.The moment I put the handcuffs on him,I realized that I could have a good sleep tonight.
That's all about my stroy.And finally,I want to give you some suggestions:First,don't hang out at night.Second,if you have seen someone stolen,the first thing you should do is to call the police.

Hello everyone, today I want to tell you about my experience working as a policewoman and the day that I caught a thief. It was a cold night,and I was patrolling in the street as usual. Suddenly, I heard an alarm from a shop behind me, and I rushed to the shop immediately. I saw that a man was stealing. Obviously, he had seen me at the same time. He was hasty and tried to run away; luckily, it didn't take much time for me to react. So, I overtoook him at once. The moment I put the handcuffs on him, I realized that I could sleep good  that night. That's all about my story, and finally, I want to give you some suggestions: First, don't hang out at night. Second, if you have seen someone stealing, the first thing you should do is call the police.

模拟一名警察讲诉遇到小偷的经历

Hello everyone. Today I want to tell you about my experience when I was a policewoman and someday I caught a thief.
It was a cold night, and I was patrolling the street as usual. Suddenly, I heard an alarm from a shop behind me. I rushed to the shop immediately. I saw a man was stealing things. Obviously, he saw me at the same time. He was hasty and tried to run away. Luckily, I didn't take much time to react, so I managed to catch him at once. The moment I put the handcuffs on him, I knew that I could have a good sleep that night.
That's all. And finally, I want to give you some suggestions: Firstly, don't hang out at night. Secondly, if you see someone steeling, the first thing you should do is to call the police.

英文里，每个句子都要有一个独立的核心思想，不应该用逗号把不相关的句子连起来：Hello,everyone,today... 应该是 Hello everyone. Today...

Stealing后面一般要加个宾语。

overtook不知道你想表达什么意思...追上？caught

realize用得不是很恰当，realise是发现、意识到、领悟的意思。

tonight是今晚的意思。既然你在阐述过去的事件，应该说that night.

还有，句号、逗号后面应该空一个格。