I appreciate the suggestion.
I appreciate your concern.
I appreciate your kindness.
I appreciate your taking time with me.
I appreciate your words.
I can't believe he did it.
I can't believe it.
I can't believe my eyes.
I can't believe this is so hard.
I can't believe you said that.
I can't stand his brother.
I can't stand it anymore.
I can't stand that smell.
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.