The initial idioms of the letter I

I don't understand	I could care less
I could eat a horse	I could eat a horse!
I could murder	I could spit!
I could tell you but then I’d have to kill you	I couldn’t care less
I couldn't agree more	I couldn't ask you to do that
I declare!	I didn't catch that remark. and I didn't g
I didn't catch the name, and I didn't catc	I do
I do believe	I don’t believe this!
I don’t mean maybe!	I don't believe it!
I don't believe this!	I don't care
I don't fancy yours (much)	I don't have time to catch my breath
I don't know	I don't mean maybe!
I don't mind telling you	I don't need this!
I don't rightly know	I don't want to alarm you, but
I don't want to wear out my welcome	I doubt it