about – exactly
above – below
absence – presence
abundance – lack
accept – refuse
accidental – intentional
active – lazy
add – subtract
admit – deny
adult – child
advanced – elementary
affirmative – negative
afraid – brave
after – before
against – for
alike – different
alive – dead
all – none
allow – forbid
already – not yet
always – never
ancient – modern
ancestor – descendant
agree – refuse

amateur – professional
amuse – bore
angel – devil
animal – human
annoy – satisfy
answer – question
antonym – synonym
apart – together
approximately – exactly
argue – agree
arrest – free
arrival – departure
arrive – depart
artificial – natural
ascent – descent
ask – answer
asleep – awake
attack – defend
attack – defence
attic – cellar
autumn – spring
awake – asleep
awful – nice