The past tense of stiffen is stiffened. See all forms of stiffen with easy examples.

The past tense of stiff is stiffed. See all forms of stiff with easy examples.

The past tense of stickybeak is stickybeaked. See all forms of stickybeak with easy examples.

The past tense of sticky-tape is sticky-taped. See all forms of sticky-tape with easy examples.

The past tense of sticky is stickied. See all forms of sticky with easy examples.

The past tense of stickle is stickled. See all forms of stickle with easy examples.

The past tense of stickhandle is stickhandled. See all forms of stickhandle with easy examples.

The past tense of sticker is stickered. See all forms of sticker with easy examples.

The past tense of stick is sticked. See all forms of stick with easy examples.

The past tense of steward is stewarded. See all forms of steward with easy examples.