The past tense of ozonise is ozonised. See all forms of ozonise with easy examples.

The past tense of oxidize is oxidized. See all forms of oxidize with easy examples.

The past tense of oxidate is oxidated. See all forms of oxidate with easy examples.

The past tense of oxidise is oxidised. See all forms of oxidise with easy examples.

The past tense of own is owned. See all forms of own with easy examples.

The past tense of oxygenate is oxygenated. See all forms of oxygenate with easy examples.

The past tense of ovulate is ovulated. See all forms of ovulate with easy examples.

The past tense of overwrest is overwrested. See all forms of overwrest with easy examples.

The past tense of oviposit is oviposited. See all forms of oviposit with easy examples.

The past tense of owe is owed. See all forms of owe with easy examples.