Ok la -- Acceptable
Ok meh (mei) -- Are you sure it's really ok?
Ok ar -- Okay, no problem. (or in some cases, adding more weight to the sentence meaning)
2 kinds of Thank you.
1. Ng goi (唔該) -- Appreciation for a person's aid; your response when somebody did you a flavor
e.g. someone hold the door for you; hand you something; take something for you, answer your question
2. Dor jei (多謝) -- Gratitude
e.g. your response when somebody give you a gift
It's a higher level of appreciation than "ng goi", so you can also use this when someone did you a huge flavor.
