Look at the examples. Then complete the rules with for and snice.
How long have they been popular?
They've been popular SNICE 1920.
He has held the record SNICE 1990.
They've probably existed FOR two thousand years.
They haven't won the championship FOR o long time.
We use (1) .... when we talk about a period of time.
We use (2) ... when we talk about the start of a period