Песни, наиболее полно иллюстрирующие различие этих видо-временных форм:
Gorky Park - Two candles
http://en.lyrsense.com/gorky_park/two_candels
Loneliness
is my only guest
Who
visits me alone at night
When it
comes I
light two candles
Just the way it was
And
pretend the flames become your eyes
Emptiness
is a friend I
guess
The shadow played upon the wall
If I
let the candles take me
I
can see your face
And remember hearing someone
call your name (
в двух абзацах говорится о ситуации, которая повторяется изо дня в день)
My candles
are crying O-o-o-o-h
Мy candles
are crying O-o-o-o-h
They
´re crying for you
They
´re waiting for you
I
´m waiting for you (
ситуация в данный момент)
Is it you
knocking at my door (
в момент речи)
Or maybe just a ghostly wind
How I wish that you were here
Sitting by my side
And you´ll bring me back to life again tonight