Question

5 using HAD BETTER and 5 using COULD

Answer 1

You had better see a doctor.
We had better rest a while.
He had better save his money. 
You had better tell her about this. 
You had better tell the truth. 

She could be back by noon.
She could return later.
You could learn at least five new words every day. 
You could call her tomorrow.
You could see her tomorrow.