[luispauloml]

    >14. Use until instead of the colloquial till.

I remember reading somewhere that "till" is actually older then "until", and that they are perfectly interchangeable, although I do see "until" way more often than the other.

[cratermoon]

Many archaic forms are still perfectly valid English, and some of them don't even seem all that odd. Modern English Usage is always changing, though, and unless you're writing period-appropriate dialog, it's best to avoid archaisms.

[mock-possum]

I prefer ‘til personally, makes it a bit more explicit what word you’re using.