Ago Saha Before - අ’ගෝ සහ බිෆෝ(ර්) - Ago and Before.
[මෙම පාඩම පසුව සිංහලට පරිවර්තනය කර, පළ කරනු ඇත!]
{This Lesson would be translated into Sinhalese & published later!}
Before as a preposition and Ago as an adverb are used to express the same meaning.
We can say: I was in Colombo three years ago.
Or I was in Colombo before 1999.
We do not say: I was in Colombo three years before.
But we can say: I was in Colombo three years before you were.