为什么 wèi shén me why?for what reason? Example sentences 你为什么想学汉语？ nǐ wèi shénme xiǎng xué hànyǔ? Why do you learn Chinese? 现在已经晚上十二点了，你为什么不睡觉？ xiànzài yǐjīng wǎnshang shí'èrdiǎn le, nǐ wèi shénme bù shuìjiào? It's already midnight now, why are you not sleeping?