here's some more-either to clarify or further confuse y'all!~
m'goi-can be also used for excuse me
M'goi is also thank you for service as opposed for a gift. If a waiter brings you water, you say, "M'goi"
but if you are given a gift, you say, "Dohr che"
you also say dohr che when your Sifu teaches you something, or after class, because he is giving you the gift of his knowledge, his time, effort, and experience, and that is certainly a gift to be treasured.
Here's one; 'Bei fan Sifu" this is losely translated as give back to your Sifu-this is not good. You are returning his gift. You didn't practice what he taught you and forgot his teaching.