Rule reminder
Common errors with perception verbs: using the gerund instead of the bare infinitive; forgetting 'di' after 'accorgersi' and 'rendersi conto'; using 'di + infinitive' instead of 'che + indicative' when subjects differ; confusing 'sentire + infinitive' (physical sound) with 'sentire che' (news/intuition).
Trova l'errore: 'Non si è resa conto di che stava succedendo.'