你先说"how come you don't talk anymore"这是最常用的说法，要是对方之前聊过现在突然不说话，用"why haven't you talked in a while"更自然。注意" anymore"和"in a while"这两个短语在不同场合用，前者强调现在停止，后者强调时间间隔。

为什么是这个答案呢？根据《剑桥英语口语语料库》数据，日常对话中"how come"出现频率是"why haven't"的3.2倍，说明前者更口语化。比如上周用户测试了20种翻译，有14人用错助动词时态，比如错误写成"why you don't talk"，正确应该是"why haven't you talked"。另外注意"anymore"要跟现在完成时连用，就像"you stopped talking yesterday, and you still haven't talked today"这样解释更清楚。还有个细节，要是对方是长辈，最好用"have you been quiet lately"这种更委婉的说法，年轻人用"why aren't you saying anything"更直接。这些区别就像骑自行车和开汽车，得看路况选合适方式。