Word formation

Question 1

act - to act -action - activity- actor//actress - active -inactive

Answer 1

acto - actuar - acción - actividad - actor/actriz - activo - inactivo.

Question 2

sail - sailing - sailor

Answer 2

navegar - navegación - navegante

Question 3

child - children - childhood

Answer 3

niño - niños - infancia

Question 4

entertain - entertaiment - entertaining

Answer 4

entretenimiento - entretenido

Question 5

sing - singer - singing

Answer 5

cantar - cantante - cantando

Question 6

afford, afforded, affordable

Answer 6

permitirse, permitido, asequible.

Question 7

add (to) - addition - in adición

Answer 7

añadir - adición -

A secretary would be a welcome/useful addition to our staff.