I can't eat any more.
I can't eat this.
I can't help feeling lonely.
I can't read the menu.
I can't remember at all.
I can't sleep.
I can't stand his brother.
I can't stand it anymore.
I can't stand that smell.
I can't stand the cold.
I can't stand the heat.
I can't stand the noise anymore.
I can't think of a better reason.
I can't think of anything.
I can't think of her face.
I can't think of it off the top of my head.
I can't think of where I left my book.
I can't wait any longer.
I can't wait for my vacation.
I can't wait for the result of the interview.