Es-tu sûre qu'ils peuvent faire ça ?

English Translation

Are you sure they can do this?

Are you sure they can do this?Are you sure they can do this?I am reading that “être sûre que“ does not take the subjunctive in affirmative statements. It takes the subjunctive in negative statements or inverted questions. So if that is the case, peuvent should be puissent.
Source: “https://www.uu.edu/dept/language/pdfs/Subjunctive.pdf “ (last page)