この場面は、Martyが1955年の父親に出会った場面です。BiffとGeorge（父親）のやり取りは、1985年のやり取りと同じだというところが面白い。blogでEnglish 9とblogでEnglish 10の場面と比べてみてください。従って、英文解釈も、9と10を参考にしてください。
Biff: What do you think you're doing?
Marty: (realises who it is) Biff?
Biff: Hey I'm talking to you, McFly, you Irish bug.
George: Oh hey, Biff, hey, guys, how are you doing?
Biff: Yeah, you got my homework finished, McFly?
George: Uh, well, actually, I figured since it wasn't due till Monday...
Biff: Hello, hello, anybody home?
Biff taps George on the head.
Biff: Think, McFly, think. I gotta have time to recopy it. Do you realise what would happen if I hand in my homework in your handwriting? I'd get kicked out of school. You wouldn't want that to happen would you, would you?
George: Now, of course not, Biff, now, I wouldn't want that to happen.
Biff: Uh, no, no, no, no.