book :class <verb>
flight :class <noun>
that :class <det>
this :class <det>
the :class <det>
with :class <det>
be :class <aux>
to :class <prep>
with :class <prep>
Bob :class <proper-noun>
kill :class <verb>
eat :class <verb>
apple :class <noun>
red :class <adjective>