TIME: soon, now, yesterday
DURATION: long, until Friday
FREQUENCY: often, never, always
PLACE: here, there, everywhere
DIRECTION: forwards, backwards
MANNER: quickly, slowly, well
DEGREE: very, too, almost
QUANTITY: much, little, enough
AFFIRMATION: yes, indeed, certainly
NEGATION: no, not
PROBABILITY: perhaps, maybe
INTERROGATIVE: when, where, why
RELATIVE: when, where, why