Why these sentences are wrong? 1.He had an ashamed feeling. 2.You have a ready dinner. 3.He had an alone sensation.?

1.He had an ashamed feeling.
"ashamed" has to be used as predicative adjective (after noun).
~ He felt ashamed.

2.You have a ready dinner.
"ready" cannot be used before noun.
~ The dinner is ready for you.

3.He had an alone sensation.?
"alone" has to be used as predicative adjective (after noun).
~ He felt alone. He was alone. He sensed alone.
~ He had a "lonely" sensation.