If you pay much attention to the oral Chinese when talking with Chinese people during the process when you study in China, you may notice the sentences with the character 少 forming the structure of 少… such as 少来and少插嘴. With the meaning of not to do something , you can understand by reading the sentence我们在谈工作，你少插嘴. At the same time, you should also know it carries the tine of impatience or the tone of stopping doing something. For instance, 你们少在这儿捣乱，再闹我就请保安了！
When mentioning the structure of 少… , you should also know another common expressions in Chinese language 少来这一套. When we apply this structure, we usually mean to show that the other party’s means cannot work on the speaker. The following dialogue might be helpful for your understanding. 甲：我是因为实在没办法才偷东西的，再说真的是第一次，你就高抬贵手放过我吧！乙：你少来这一套！跟我们走！It can be used for carrying the warning tone. Besides, you can just say 少来这套.
The most frequently used word for expressing certain reasons is 因为. However, during the period when you study Chinese, teachers would teach you another oral expression of the same meaning谁让…呢. You can use it both for giving the reasons why the speaker wants to do so and emphasizing the reasons of making such a mistake. For instance, 你想用就拿去吧，谁让咱们是朋友呢.
You should pay more attention to the tones when you use it after you study Mandarin online. When it refers to the first paraphrase mentioned above, sometimes it has the tone of having no choice but to do it like真拿你没办法！用吧，谁让我是你哥哥呢. When it is used to emphasize the reason of mistakes, it carries the tone of complaint. For example, 谁让你不听我的呢，现在后悔了吧？