The past tense of collaborate is collaborated. See all forms of collaborate with easy examples.
The past tense of coll is colled. See all forms of coll with easy examples.
The past tense of coldwork is coldworked. See all forms of coldwork with easy examples.
The past tense of coldcock is coldcocked. See all forms of coldcock with easy examples.
The past tense of cold-shoulder is cold-shouldered. See all forms of cold-shoulder with easy examples.
The past tense of coke is coked. See all forms of coke with easy examples.
The past tense of cojoin is cojoined. See all forms of cojoin with easy examples.
The past tense of coitize is coitized. See all forms of coitize with easy examples.
The past tense of coit is coited. See all forms of coit with easy examples.
The past tense of cointegrate is cointegrated. See all forms of cointegrate with easy examples.