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 ...

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 ...