Good morning, have you got

Obligation-must,have to
No cal que-doesn't,don't,didn't(have to)
No es necessari que-needn't
Prohibition-musn't,can't
Possibility-may,might,could,must(estic segura)
               can't(no m'ho crec)
Ability-can,could,be able to(serà capaç)

Possibility in the past-may/might have+v.Past.part
(She may have won the competition)
Certainty-must/can't have+v.Past.Part

ANTONYMS
simple-challenging    irritating-soothing
inaudible-deafening   deep-highpitched
bland-catchy             thought-provoking-uninteresting

catchy-pegadiza             bad-tempered(malhumor)
bland-sosa                    big-headed(creido)
challenging-desafiante    good-humoured,looking
deafening-ensordecedor  hard-working,long haired              
high pitched-agudo         sell-out(agotarse)
uninteresting-aburrido     well-known(famoso)
annoyed-molesto             exhausted-agotado
dissapointed-decepcionado