SOCIAL OR SOCIABLE? siting or sitting? site + ing = siting sit + ing = sitting See ADDING ENDINGS (i) and (ii). Both spellings are correct. See EI/IE SPELLING RULE. sizable/sizeable skein skilful skilfully slain slander slily/slyly sloping or slopping? sly slyly slyness smelled/smelt skilful + ly (exception to -y rule) See ADDING ENDINGS