Continuing on the same page we read, &quot;Cars often skid on icy streets because the smooth surface of the ice reduces the friction between the tires and the road.
(we; read; ) (Cars; skid; L:on icy streets; because the smooth surface of the ice reduces the friction between the tires and the road; T:often) (the smooth surface of the ice; reduces; the friction between the tires and the road)
we Cars the smooth surface of the ice
read skid reduces
L:on icy streets because the smooth surface of the ice reduces the friction between the tires and the road T:often
the friction between the tires and the road