If I say to one of my daughters "Be careful" that means pay attention to what you're doing cuz you might get hurt. If I say "Be very careful" that means they should pay attention cuz they could get hurt bad. If I say "Be very very careful" (this one is usual in a much deeper tone) that means they could get hurt bad and then I'm gonna kick their but too cuz I told em very twice and that should've persuaded em not to be doin risky stuff.
Other than that, maybe it's just a studdering thing.
Other than that, maybe it's just a studdering thing.