+0

I'll accept the deal under the condition that he marry her.

I'll accept the deal under the condition that he marries her.

I'm pretty sure that the subjunctive (marry) is correct, but would the indicative be acceptable as well?

+1

I'd say "on condition that he marry her" (with the "subjunctive").

PECULIAR773would the indicative be acceptable as well?

Yes.

CJ