When it's before the hour (but after 30 minutes past) we say to. We often use descriptions such as 'quarter past' and 'half past' to tell the time, but it's also good to be able to say exactly how ...

Saying what time it is - on the hour Quarter past, half past and quarter to Saying ... happen Quiz Use son las followed by a number to tell the time on the hour. For one o’ clock only use ...