Can

MODAL VERB CAN
I. CAN = PODER (Habilidad) Presente
CAN NOT = CAN’T
1. You can teach.  You can’t teach. 
2. We can play.  We can’t play.

3. Can you help me? Yes, I can
No, I can’t
Can you teach?
Can we play?
II. COULD = PUDO (Habilidad) Pasado
COULD NOT = COULDN’T
1. You could teach.  You couldn’t teach.  Could you teach?
2. We could be happy.  We couldn’t be happy.  Couldn’t we be happy?
3. Could you arrive? Yes, I could
No, I couldn’t
a) Two days ago I could travel.
b) Currently I ……….. sleep early.
ACTUALLY = De hecho
c) Yesterday I ………… go.
d) Nowadays I ……… talk with you.
e) Yesterday I couldn’t smoke, because I was in a church.