Cláusulas de Tempo.

Before: antes
 Exemplos: before I moved into this house, I lived there


after: depois
Exemplos: after you left, I went in that shop on the side of your house.

when: quando
Exemplos: when I was in high school, was the coolest
my dad was watching tv, when i arrived

while: enquanto
while my mother was cleaning the house, i was watching tv
while i was in the school, my mother was sleeping