it´s not a verb so there is no past tense.
The past tense is marauded.
The past tense is battled.
The past tense of march is marched.
The past tense of fortify is fortified.
Yes, was is the past tense. The sentence in present tense would be: I am interested in working on the presidential campaign if the opportunity still exists.
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."