"Been" is the past participle of "be".
Past tense.
"Had been" is the past perfect tense of be.
'Ought to be' is present tense. 'Ought to have been' is past tense.
The past tense of "differ" would be "differed".
Had been is past perfect.
The past tense is was or were.The past participle is been.
Been is the past tense of be.
Past tense.
Past tense.
Past tense
The past tense of be is were/was; the past participle is been.
Was and had been.
The past tense of the verb "to be" is "been."
"Had been" is the past perfect tense of be.
Past tense - was and were. Past participle - been.
Have been is present tense and had been is past tense.
Am is the present tense, first person singular conjugation of be. The past tense is was, and the past participle is been.