He is ashamed for his former dishonorable action.
As for you, you ought to be ashamed of yourself.
The poor boy was ashamed of his ragged cloths.
He was ashamed that he had lied.
I was too ashamed to tell her that I had failed.
feeling shame or guilt or embarrassment or remorse
1. 羞愧的, 感到难为情的[(+of)][+to-v][+that]
She was ashamed of having failed in the examination.
2. 耻于……的, 因难为情而不愿……的[+to-v]
She was ashamed to tell anyone that she had fallen in love with him.