Nunc laetus es, sed nuper non laetus eras. Cur miser eras?
Key: Now you are happy, but recently you weren’t happy. Why were you sad?
I don't have "sad" as a meaning for misera; wretched, unfortunate. Is there another definition someplace that I missed?
Nunc sum apud socios meos.
Nunc laeti sumus et erimus.
Now I am with my companions. Should be among.
Now I am and will be happy. Should be plural, ...