me hacen un gran favor de ayudarme porfa .
Respuestas a la pregunta
El error te lo dejaré en negrilla, y con la linea
b. My sister could doing karate when she was four
My sister could do karate when she was four.
c. My dad couldn't to drive when he was young
My dad couldn't drive when he was young
d. Could you played the piano two years ago?
Could you play the piano two years ago?
e. They were eat with chopsticks when they were six
They could eat with chopsticks when they were six
f. I could to do origami when my teacher showed me
I could do origami when my teacher showed me
g. We couldn't undestanding english before we started school
We couldn't understand english before we started school
h. How many languages can you speak when you were seven?
How many languages could you speak when you were seven?
Explicación
La regla del could es poder pero en "Pasado" de podía... "El podía caminar", "ella podia bailar"
El can es como en presente "Yo puedo" "Tu puedes".....
Entonces la regla con el could va Could+ Verbo normal, nada que tenga que ver con el verbo en pasado "ed", ni "to" , ni "ing".
solo normal Could do, could dance...