Answer:
Phrasal verb light up | light something up to become or to make something become bright with light or colour There was an explosion and the whole sky lit up.
The last one is uses capitalization correctly. “According to my grandmother, Hungarian is the second hardest language to learn.”
The used rhetorical device is Hyperbole.
Saying that something is a billion times better is hyperbole because it is not really that much better, you would just be over exaggerating.
This is a Compund-complex sentence
