How do I put these sentences in the subjunctive tense? Please help me!

It is too bad that he died sitting in his chair signing papers in his Cardinal robe.

C'est dommage qu'il soit mort assis (seated, I'd say, rather than assayant) dans sa chaise signant des papiers dans sa robe de cardinal.

Why didn't you do the part of it that you could? If you need a good dictionary, let us know.

Sra (aka Mme)