How to respond when your car's battery light goes on<br>Resist the urge to panic. When your battery light comes on, it sometimes results in a very simple solution. Look at your gauges.
sometimes car lights come on 
The author is insinuating that car lights sometimes come on for smaller reasons, which intuitively means they sometimes come on in general
( z0 on :ARG1 ( z1 light :mod ( z2 car ) ) :frequency ( z3 sometimes ) )
(z0 / on-01
    :ARG1 (z1 / light
              :mod (z2 / car))
    :frequency (z3 / sometimes))
sometimes car lights come on
z1 :mod z2
z0 :ARG1 z1
z0 :frequency z3