1. trabajar - (working)
2. practicar - (doing - sports / activities)
3. jugar - (playing - sports)
4. escribir - (writing)
5. ver - (watching)
6. salir - (going out)
7. beber - (drinking)
8. estudiar - (studying)
9. tocar - (playing - instruments)
10. vivir - (living)
11. hacer - (doing / making)
12. navegar - (surfing - the Net)

Some irregular gerunds to look out for:

(to go) ir - yendo, (to fall) caer - cayendo, (to hear) oír - oyendo,
(to read) leer - leyendo, (to sleep) dormir - durmiendo, (to say) decir - diciendo,
(to be able), poder - pudiendo (to ask), pedir - pidiendo, (to come) venir - viniendo.