The past tense of harsh is harshed. See all forms of harsh with easy examples.
The past tense of harp is harped. See all forms of harp with easy examples.
The past tense of harness is harnessed. See all forms of harness with easy examples.
The past tense of harnass is harnassed. See all forms of harnass with easy examples.
The past tense of harmonize is harmonized. See all forms of harmonize with easy examples.
The past tense of harpoon is harpooned. See all forms of harpoon with easy examples.
The past tense of harm is harmed. See all forms of harm with easy examples.
The past tense of harlot is harloted or harlotted. See all forms of harlot with easy examples.
The past tense of harlequin is harlequined. See all forms of harlequin with easy examples.
The past tense of harken is harkened. See all forms of harken with easy examples.