The Star Wars YouTube channel recently posted a clip from The Empire Strikes Back, and I noticed an extremely minor point about the scene.
After his X-Wing sinks into the swamp, Luke complains to R2-D2 that "we'll never get it out now." Yoda then asks, "So certain are you?" The phrase "so certain" alliterates, and the repetition involved lends a slight sense of degree (for "so").