1. The stolen diamond necklace is insured for five million dollars.
2. I have insured the stolen diamond necklace for five million dollars.
3. I insured the stolen diamond necklace for five million dollars.
4. I insure the stolen diamond necklace for five million dollars.
(What is the active sentence of #1 among the rest?)
Either 2 or 3 works as the active form of 1 -- 3 is probably best.
4 is incorrect for this purpose.