A man, and presumably his son, out on a bike ride.
a man a boy are on a bike ride
A son is male. A man and a boy are on a bike ride.
exists s1 x1 x2 x3 x4 x5.(a_topic(s1) & subset_of(x2,s1) & on(x3,x4) & n_ride(x4) & of(x4,x5) & n_bike(x5) & out(x2,x3) & n_thing(x3) & r_presumably(x2) & n_son(x2) & of(x2,x1) & n_male(x1) & subset_of(x1,s1) & n_man(x1))
all x1.(n_boy(x1) -> exists p1 x2.(exists x3 x4.(on(x2,x3) & n_ride(x3) & of(x3,x4) & n_bike(x4)) & for(x2,x1) & n_man(x2)))