Rule reminder
Group 2 key rules: 'prima che' = before, always + congiuntivo; 'finché' = as long as (continuous, no endpoint); 'finché non' = until (endpoint, 'non' is not negation); 'quando' + futuro semplice/anteriore in future contexts — never present tense for specific future events.
Avvisami _____ cominci la riunione.