Get is future tense for have so for example: I have these things. I'm going to go get those things. Job and work mean the same thing for the most part but it's the way we use them for example: I have to go to my job so i can go do some work Good afternoon is for when it's the middle of the day all the way until it gets dark and after it is getting dark then its good evening Hope i helped out sorry if its hard to understand