The past tense of do is did. We did a lot of work today. And the future tense of do is will do or going to do or am/is/are doing. I will do the washing tonight. She is going to do the washing...
The verb "to tense" (transitive/intransitive) forms the regular past tenses and participle "tensed."Example :"He tensed in anticipation of the verdict.""I tensed my legs and prepared to leap."
Our is a possessive determiner - not a verb- it can be used in past or present sentences. It is not past or present . They saw our dog on the road. They see our mother everyday.