I'm very lonely. I would say my glass is damn near empty.
I'd say at this second in time. I am having my glass 3/4 full and in month or two it will spill over if I get my way.
My glass is empty because I drank it.
A romantic relationship. Yes, I feel pretty darn empty. The glass isn't even a quarter full on some days.
When I was born my glass was 1/2 full but there's a crack in the bottom so some has leaked out. Now it's 1/4 full and there's a ring on the table around my glass to remind me of the liquid I lost
I think what is in the glass is more important than the amount...