1. He not only reads, but also writes.
Non modo legit, sed etiam scribit.
2. They neither cry nor laugh.
Neque flent neque rident.
3. Why don't you dance?
Cur non saltas/saltatis (singularis/pluralis)
4. Today I won't work.
Hodie non laborabo.
5. You are walking with your mouth closed.
Ore clauso ambulas.