>Final presentation coming up real soon and I could use some help with colloquial spanish.
>
>Situation 1: You're talking to your grandson and tell him that you've got a present for him if he's been good. His reply is "I've been good."
>
>What would be the most gramatically correct translation and what would the child actually say?
>
>(Probably the most difficult topic for me so far has been the varying past tenses. Can't get it through my skull which one to use when).


His reply would be:
"me he portado bien"



>Situation 2: At the end of your three minute set at open-mic night at your local spanish class (errrrrr.........comedy club), how would you say
>
>"Don't forget to tip your servers"

The word 'server' or 'waiter' depends on the country as there are differences in Spanish. Maybe the following:

"No olvides de dar una propina al mozo"
"No olvidar de dar una propina al camarero"