The word "ashamed" is the same in any tense, but you can use the being verb associated with ashamed to change the tense. For the past tense you would simply use being verbs with the past tense connotation, such as "were" or "have been" or "was", then it would become the past tense "were ashamed" and "was ashamed".
Ashame is not a word. Try shame, shamed, or ashamed.
"I feel shame"
"I shamed myself in a public forum by not knowing that ahsame is not a word, even though there is a little red line under it from the spell checker"
"You should be ashamed of yourself"
The present tense of the word "ashamed" is "ashame."
the past tense of am is was and the past tense of has is had
The past tense of "has" is "had" and the past tense of "have" is "had."
Was and were are both the past tense of be. The present tense is: I am he is you are they are The past tense is: I was he was you were they were
"will be" is the future tense of "be". The past tense of "be" is "was/were".
The past tense of "she do" is "she did."
The word "were" is past tense. It is the past tense of the verb "to be."
The past tense of "will" is "would" and the past tense of "be" is "was" or "were" depending on the subject (singular or plural).
The past tense of "am" is "was" and the past perfect tense of "has" is "had."
HAD is the Past Tense of TO HAVE.
The past tense of "have" is "had."
The past tense of "you will not" is "you would not."