Did he could understood the English when he was 6.
No but he can speak it now.
Will you be able to come to my party next week.
We ran to the station and couldn't cough the last train.
I'm sorry, I can't hear you.please speak more loudly.
She couldn't ride a bike until she was twelve.I looked for my keys , but I Can't find them any where.
Could you speake to Jack last night.
The vet gave my dog some medicine, and the vet could made my dog better.