Expresiones habituales con las preposiciones AT - ON - IN (que difieren de las reglas) :

at the moment
at this/that moment
at the same time
at no time
at present
at the end/beginning
at 37 kph

on vacations/ holidays
on the radio
on television
on the internet
on the menu
on the agenda

in a loud voice
in a good/ bad mood
in a green dress
in new shoes
in bed
in business
in hospital
in prison

... a Clínica de inglés

... a Lighthouse-school
... a verbanet.com.ar

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