forewarning

forewing

forfeiting

forfending

forgathering

forgetting

forging

forgiving

forgoing

forjudging

forking

forklifting

formalising

formalizing

formatting

formfitting

forming

formularizing

formulating

formulizing

fornicating

forsaking

forswearing

forthcoming

fortifying

fortressing

fortuning

forwarding

fossicking

fossilising

fossilizing

fostering

fosterling

fouling

foundering

founding

foundling

fountaining

fowling

foxhunting

foxing

foxtrotting

fracking

fractionalizing

fractionating

fractioning

fracturing

fragging

fragmentating

fragmenting