@greeny
ok, don't get all riled up about the floor thing. You know I like you, right:)
Now back to your ignorance:)
For future reference just for you
Quirk et al quote
The perfective with temporal since-clauses
(i) Verbs used statively (cf 4.28ff) -particularly be and seem - may take
nonperfective forms when the predication is durative:
It's OK since I had it fixed.
Things are different since you've gone.
Since Pat left, it seems dull here.
The most common pattern that falls under this exception is It + BE + a
time expression, in which the verb may be in the simple present or simple
past, or have the will-future. Nonperfective forms are normal here:
It's ten years since they were last here.
How long is it since you last spoke to them?
It was ages since they last paid their bills on time.
Next Tuesday it will be six years since I became an American citizen