Calculator is a noun and doesn't have a past tense. Verbs have past tenses. The relevant verb for calculator is calculate.
The teacher calculates our test percentages over the weekend. - present
We calculated how much food we would need for the trip. - past
Flew is the past tense of fly; counted is the past tense of count.
The past tense is stepped.
The past tense is enumerated.
The past tense is rectified.
The past tense of add is added.
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 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". The past tense of "to be" is "was" or "were".
HAD is the Past Tense of TO HAVE.
The past tense is had.
The past tense of "am" is "was" and the past perfect tense of "has" is "had."
The past tense of "you will not" is "you would not."
Past tense I had Present tense I have Future Tense I will have