. . . . at playing an instrument, Bea or Sue? Bea is.
Who's better
. . . . better than . . . . at . . . .
...
Tim is . . . . at street dancing.
the best
. . . . worse than . . . . at . . . .
...
Bea is . . . . at playing musical instrument.
the best
Who's worse at doing cartwheels, Matt or Dave?
Dave is.
Who's better at playing an instrument, Tom or Sue?
Sue is.
. . . . the best at . . . .
...
Sandra is . . . . Jane at street dancing.
better than
Who's the worst at street dancing?
Jen is.