Bonjour Leah !
This is an excellent question. The difference here relates to impersonal expressions. Here's the rule: - When you have a real subject, like "première erreur" - i.e. to do. - and that the infinitive is used intransitively (without a object), then the structure is:[subject/adjective] + à + [infinitive]
La première chose à faire... The first thing to do... C'est bon à savoir. That's good to know.
- When you have a *dummy* subject - i.e. it is to do - the structure is:il est/c'est + [adjective] + de + [infinitive]
Il est difficile de parler. / C'est difficile de parler. It's hard to talk. Il est important de faire confiance à ses amis. It's important to trust one's friends.
I hope that's helpful!À bientôt !
Bonjour Helen !
Here it's not a case of impersonal expressions, but a case of reported (or indirect) speech, hence the use of de :
Je lui demande de venir. -> I ask him to come.
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