Sorry, just let me finish my point.
抱歉，让我把话说完。
May I just finish?
能让我完吗？
May I finish what I was saying?
能让我说完我要说的话吗？
Please allow me to finish.
请让我说完。

Sorry，Samsik，can we let Samsoon finish?
抱歉，萨姆斯克，我们能让三顺说完吗？
Can you wait for a minute?
你能稍等-下吗？
Can you wait until he finishes his point?
你能等他说完他的观点吗？
Why don't you wait until she's done?
你为什么不等她把话说完呢？