benefit_ed_, benefit_ing_, benefi_cial_.

Similar are:

differ, summon, model.

200. Words ending in silent _e_ drop the _e_ before a suffix beginning
with a vowel; as,

arrive, arriv_ing_, arriv_ed_, arriv_al_.
precede, preced_ed_, preced_ing_, preced_ence_.
receive, receiv_ed_, receiv_ing_.

Similar are:

move, write, blame, tame, come, receive, believe, relieve, grieve,
deceive, conceive, perceive, seize, precede, concede, supersede,
recede, argue, rue, construe, woe, pursue.

201. Words ending in _-ge, -ce_, or _-se_, retain the _e_ before
endings: as,

arrange, arrangement; arrange, arranging.

Similar are:

gauge, manage, balance, finance, peace, service, amuse, use.

202. Words in _-dge_ do not retain the _e_ before endings; as,
acknowledge, acknowledg_ment_, acknowledg_ed_, acknowledg_ing_.

Similar are:

nudge, judge.

203. Most words ending in _y_ preceded by a consonant change _y_
to _i_ before all endings except-_ing_:

busy, bus_iness_, bus_ied_, busy_ing_.

Similar are:

duty, mercy, penny, pity, vary, weary, study.

204. WORDS OF SIMILAR SOUND:

canvas (cloth) principle (rule)
canvass (all meanings except _cloth_) principal (chief)
capitol (a building) stationary (immovable)
capital (all meanings except _building_) stationery (articles)
counsel (advice or an adviser) miner (a workman)
council (a body of persons) minor (under age)
complement (a completing element) angel (a spiritual being)
compliment (praise) angle (geometrical)

205. MISCELLANEOUS WORDS:

annual laundry schedule
awkward leisure separate
beneficial lenient Spaniard
decimal license speak
exhilarate mechanical specimen
familiarize mediaeval speech
fiber medicine spherical
fibrous militia subtle
genuine motor surely
gluey negotiate technical
height origin tenement
hideous pacified their
hundredths phalanx therefore
hysterical physique thinnest
icicle privilege until
irremediable prodigies vengeance
laboratory rarefy visible
laid