past tense of tool is tooled.

How do you know if a word is past tense?

The past tense refers to event that have happened in the past. The basic way to form the past tense in English is to take the present tense of the word and add the suffix -ed. For example, to turn the verb "walk" into the past tense, add -ed to form "walked." .

Is envisioned a past tense?

past tense of envision is envisioned.