Question

can', 'can't', 'could' or 'couldn't'. explicacion , .

Answer 1

can = puedo
can't = no puedo
could = podria
couldn't = no podria

ejemplos:
Can i go to the toilet please? = puedo ir al baño?
I can't go to the party = no puedo ir a la fiesta

could you do my homework? = podrias hacer mi tarea?
You couldn't be quiet? = no podrias estar callado?