AT x IN x ON

Prepositions of Time and Place, it´s very easy !

Take a look:

TIME

AT
horas = AT TEN O’CLOCK
período do dia = AT NIGHT
fim de semana (BrE) = AT THE WEEKEND, feriados = AT CHRISTMAS AT EASTER etc.

ON
dias = ON MONDAY, ON NEW YEAR’S EVE, ON HER BIRTHDAY
períodos do dia = ON FRIDAY AFTERNOON
fim de semana (AmE) = ON THE WEEKEND

IN
períodos do dia = IN THE MORNING, IN THE AFTERNOON, IN THE EVENING
meses = IN DECEMBER
estações do ano = IN THE WINTER
anos = IN 1998
século = IN THE NINETEENTH CENTURY

com “NEXT” e “LAST” = NEXT MONDAY, NEXT MAY, LAST WEEK, LAST MONTH etc.
com “THIS” = THIS MORNING, THIS WINTER etc.
com “TOMORROW” e “YESTERDAY” = TOMORROW EVENING, YESTERDAY MORNING, THE DAY BEFORE YESTERDAY etc.

PLACE

AT
ponto (geralmente locais públicos) = AT HOME, AT SCHOOL, AT THE BUS STOP, AT THE AIRPORT, AT A PARTY, AT WORK etc.
endereço completo = AT 138 CHESTNUT ST., AT 90 BURNHILL RD., AT 179 PARK AVE etc

ON
superfície ou linha = ON THE TABLE, ON THE ROAD, ON THE RIVER, ON AN ISLAND, ON A PAGE, ON MAIN STREET etc.
transporte público = ON THE BUS, ON THE PLANE, ON THE SUBWAY, ON THE TRAIN etc.

IN
dentro = IN THE HOUSE, IN THE KITCHEN, IN AFRICA, IN PARIS, IN THE MIRROR, IN THE CAR, IN BED etc.