s::=np vp
np::=det adjp n
det::= the | a | my | one | some 
n::=pants | cat | dog | student | guinea pig | quantum mechanics
vp::=iv | tv np 
iv::=is | died | sleeps | sang | lives | exploded | compiled
tv::=punched | kicked | calculated | hugged | rearranged | ate
adj::=sticky | smart | stupid | ugly | big | shiny | suspicious | expensive
adjp::=adj | adj adjp