a (an) & one
about & on
about, on & with
about, round & around
above & over
accept & receive
accident & incident
ache & pain
across, along & through
affect, effect & influence
after & in
after & behind
ago & before
alive, living & live
all, every & each
all & whole
allow & permit
almost & nearly
alone, lone & lonely
aloud, loud & loudly
also, too, either & as well
although & though
among & between
announce & declare
answer & reply
anxious & eager
any & some
appear，look & seem
appreciate & enjoy
appreciate & thank
area, region & district
army & troop
arrive, get & reach
ashamed & shameful
at, in & on
attempt & try
awake, wake, awaken & waken
bath & bathe
bank, beach, coast, shore, seashore & seaside
beat, hit & strike
beat & defeat
beautiful, pretty, good-looking & handsome
because, since, as & for
because & because of
become, get, turn & go
before long & long before
begin & start
below & under
besides, but & except
big, large & great
a bit & a little
boat & ship
born & borne
borrow & lend
bread, loaf & roll
break in & break into
bring, take, get, fetch & carry
broad & wide
burst into & burst out
but & however
by & till
cause & reason
centre & middle
certain & sure
certainly & surely
chair & seat
chance & opportunity
chief & main
choose, pick & select
cinema, film & movie
city & town
class & lesson
clean & cleanly
clear & clearly
clever & wise
climate & weather
close & closely
close & shut
clothes, clothing & dress
collect & gather
college & university
command & order
complete & finish
continue & go on
correct & right
cost, spend & take
country, nation & state
cross & across
cure & treat
custom & habit
daily, everyday & every day
damage, destroy, ruin & spoil
dance & ball
dark & darkness
day by day & day after day
deep & deeply
delay, postpone & put off
demand & require
die away, die down, die off & die out
direct & directly
discover & find
discover & invent
disease, illness & sickness：
distant & far
divide & separate
door & gate
draw & paint
draw, pull & drag
dress, wear, put on & have on
drop & fall
due to, because of & owing to
during & while
during & for
during & in
each other & one another
earth, world & globe
easy & easily
economic & economical
edge & side
elder, eldest & older, oldest
electric & electrical
escape & flee
especially, specially & particularly
everyone, everybody & every one
expensive & dear
factory, mill, plant & works
fairly, quite, rather, very & pretty
family, home & house
farther, further & farthest, furthest
fast, quick & rapid
fault, mistake & shortcoming
few, a few & little, a little
final & last
finally, at last & in the end
find & find out
firm & firmly
first & at first
first & firstly
fit & suit
floor & storey
foolish, stupid & silly
for & to
forget & leave
forgive, excuse & pardon
fortunate & lucky
free & freely
gain & earn
game & match
gaze, glare & stare
gift & present
give away, give out & give off
give in & give up
glide, slide & slip
gold & golden
good & well
happen, occur & take place
healthy & healthful
healthy, fit & well
hear & listen
high & tall
high & highly
highway, freeway, expressway & motorway
hire & employ
holiday, vacation & leave
hope & wish
how far & how long
how many & how much
how long, how often & how soon
hurt, injure & wound
if & whether
ill & sick
impolite, rough & rude
in & into
include & contain
income, pay, wage & salary
insist & persist
interested & interesting
job & work
join, take part in & attend
keep & keep on
kind & kindly
kind & sort
lately & recently
laugh, laughing & laughter
lay & lie
learn & study
leather & skin
life & living
lighted & lit
like & as
likely & probable
long & (for) a long time
look, see & watch
madam & madame
manage & try
many & much
matter & affair
may & might
maybe & may be
meantime & meanwhile
meet & meet with
method, way & means
more than & more ... than
Mrs, Ms & Miss
much too & too much
must & have to
near & close
no & not
no less than, no less ... than & not less than
no more than & not more than
no one, nobody & none
no longer, not ... any longer & no more, not ... any more
noise, sound & voice
officer, official & clerk
onto & on to
ordinary, common, usual & general
ought to & should
people & person
pleasant, pleasing & pleased
possible & probable
problem & question
produce, product & production
provide & supply
quiet, silent, still & calm
raise & rise
real & true
refuse & reject
rescue & save
right & rightly
road, path & way
rob & steal
scene & scenery
seat & sit
skilled & ski(l)lful
slow & slowly
small & little
sometime, some time & sometimes
space, place & room
speak, talk, say & tell
story & tale
surrounding & environment
technology & technique
telegram & telegraph
thankful & grateful
training, practice, exercise & drill
travel, trip & journey
unless & if ... not
until & till
used to & be used to
used to & would
valuable, invaluable valueless & valued
various & different
very, much & very much
wait (for) & expect
when, while & as
worth, worthy & worthwhile