By the definition of chemical change, we come to know that during chemical change a new substance must form.
(we; come; ) (we; to know; that during chemical change a new substance must form) Context(we to know,List([38, 53))):(a new substance; must form; T:during chemical change)
we to know,List([38, 53))
we we a new substance
come to know must form
that during chemical change a new substance must form
T:during chemical change