啦 form a greeting Please use 啦 to form a greeting in the following situations: Example 1: 朋友病了一礼拜以后, 第一次来上课。---> 你好啦? Example 2: 看见朋友开着一辆新车来上班。 (买新车) --> 你买新车啦? 一进门看见弟弟的朋友要回家。(不坐) I don't know how to use 不坐 to greet him.... Maybe 你不坐电梯去啦? But 啦 indicates some kind of change.. but there's no change in "你不坐电梯去啦?" ... except if I asked 你这次不坐电梯去啦? but I wouldn't yet know if he planned to use the elevator so this question/greeting sounds strange too. If I had 呆 (stay ) as an option, I'd ask him 你不呆啦? "你不坐啦?" sounds strange to me, because why would you ask someone if he's not sitting (anymore) while meeting him at the door. What would be a correct answer?