A phrase like - able to take - would usually be used after a be verb eg was able to take/is able to take. like this the be verb shows the tense:
He was able to take some time off. -- past tense
The doctor is always able to take new patients. -- present tense
The past participle of "to be" is "been". Able is an adjective.
Capable is not a verb, it's an adjective. Adjectives do not have past tenses.
To have been able.
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).
HAD is the Past Tense of TO HAVE.
The past tense of "am" is "was" and the past perfect tense of "has" is "had."
The past tense of "have" is "had."
The past tense of "you will not" is "you would not."
The past tense of "exist" is "existed." The past perfect tense is "had existed."