Planes<br>The planes flying overhead woke me up. I was grumpy, and tried to block out the noise. Eventually I started to worry about it. I got up and checked the news. The military was just conducting practice runs.
planes were invented in 2002
it does not say when planes were invented
( z0 invent :ARG1 ( z1 plane ) :time ( z2 date-entity :year 2002 ) )
(z0 / invent-01
    :ARG1 (z1 / plane)
    :time (z2 / date-entity
              :year 2002))
planes were invented in 2002
z0 :ARG1 z1
z0 :time z2
z2 :year 0