It was most likely an owl, because it was most likely that the fox would be abroad by night.
(It; was; most likely; because it was most likely that the fox would be abroad by night) (it; was; most likely that the fox would be abroad by night) (the fox; would be; abroad; T:by night)
It it the fox
was was would be
most likely because it was most likely that the fox would be abroad by night
most likely that the fox would be abroad by night
abroad T:by night