Tener, querer, necesitar, poder, Ir.
I was getting very frustrated that my Spanish students were still asking me (in English) "can i use the bathroom, I need a pencil, do you have a piece of paper, I need a pen" etc....
Here are the for 5 basic verbs sign print outs, which students use every day.
I also made some blank ones which once laminated would be great dry-erase practice signs.