4. This road leads into the mountains.
7. They're very into new music.
They're also very into each other.
(When used as an idiom, "into" means "to like." I'm into rock'n'roll. She's into yoga. We're into Indian food.)
9. Around Halloween, many people carve pumpkins into jack-o-lanterns.
"into" is similar to "in" but not the same.
more prepositions here
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