Ragazza di 17 anni

Aiutoooo, ho un dubbio che nemmeno chat GPT riesce a risolvere. Dov'è l'errore nella frase: «Sarah WOULDN'T be pleased if we DON'T finish this report by tomorrow"...Si dice "Sarah WON'T be pleased if we DON'T finish this report by tomorrow" oppure "Sarah WOULDN'T be pleased if we DIDN'T finish this report by tomorrow"???