Maintained
To "maintain" would be in the present tense. "Maintained" would be the past form.
"maintenance" is a noun, therefore - it has no tense. The related verb is "to maintain" ("maintained" - Past Tense).
The word maintain is a verb. The past tense is maintained.
Maintenance can only be used in the present tense. The verb is "to maintain" so the past tense is "maintained". You could also say "maintenance was carried out" which would put it in the past tense, as "carried" becomes the verb.
Maintained is already the past participle of maintain. It's also the past tense.
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.
No. Maintained is the past tense and past participle of a verb (to maintain). It cannot be a preposition.
The word "were" is past tense. It is the past tense of the verb "to be."