Il est impossible
C’est impossible

The Subjunctivisor!

Does il est impossible / c’est impossible require the subjunctive?

Yes, il est impossible / c’est impossible requires the subjunctive:

Par exemple…

Il est impossible / C’est impossible qu’elle ne le sache pas.
It’s impossible for her not to know.

Il est / C’est impossible is an impersonal expression.

Related: Does il est possible need the subjunctive?

The Subjunctivisor!  |  Subjunctive lesson

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