For Saha Since - ෆො(ර්) සහ සින්ස් - For and Since.
[මෙම පාඩම පසුව සිංහලට පරිවර්තනය කර, පළ කරනු ඇත!]
{This Lesson would be translated into Sinhalese & published later!}
For refers to a period of time.
We have not heard from him for two years.
Since is used when a particular time is referred to (a certain year, month, day or hour).
I have not seen you since Christmas (or 1939, or last Tuesday, etc.).