For people who you see almost every day, e.g. family members, work colleages etc., to these people you could say
For people you don't see every day, you would probably say something just to be polite, like ËÇÑ´´Õ 'waddee.
For people you know but haven't seen in a while you could say
The word ºéÒ§ bang can be very long e.g. à»ç¹ä§ºéÒÒÒÒÒ§ bhen ngai baaaaang - normally women do this.
Around meal times you could say
There is a certain degree of reading between the lines. When you remark to someone about the weather, often you are not looking for a detailed weather forecast but just to get a sense of how things are with that person. If the answer is negative then you know something is up.