The Subjunctivisor!
Does il est sûr / c’est sûr require the subjunctive?
Il est sûr / C’est sûr may require the subjunctive, depending on whether it is used affirmatively, negatively, or interrogatively:
Par exemple…
Il est sûr / C’est sûr qu’il est à l’heure.
It’s certain that he’ll be on time.Il n’est pas sûr / Ce n’est pas sûr qu’il soit à l’heure.
It’s not certain that he’ll be on time.Est-il sûr / Est-ce sûr qu’il soit à l’heure ?
Is it certain that he’ll be on time?
Il est / C’est sûr is an impersonal expression.
Related: Does être sûr need the subjunctive?
The Subjunctivisor! | Subjunctive lesson
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