Hermione let out a great sigh and Harry, amazed, saw that she was smiling, the very last thing he felt like doing.
"Brilliant," said Hermione. "This isn't magic –– it's logic –– a puzzle. A lot of the greatest wizards haven't got an ounce of logic, they'd be stuck in here forever."
"But so will we, won't we?"
"Of course not," said Hermione. "Everything we need is here on this paper. Seven bottles: three are poison; two are wine; one will get us safely through the black fire, and one will get us back through the purple."
"But how do we know which to drink?"
"Give me a minute."
(Harry Potter and the Sorcerer's Stone)
How do you call ‘so’ in grammatical terms?