Fog is rain before it collects together to form raindrops.
(Fog; is; rain; T:before it collects together to form raindrops) (it; collects together; to form raindrops) Context(it collects together,List([19, 39))):(it; collects together to form; raindrops)
it collects together,List([19, 39))
Fog it it
is collects together collects together to form
rain T:before it collects together to form raindrops
to form raindrops
raindrops