Q: If Discretion when using your camera is advisable here., can we say that "Use your camera at your own discretion."?

A: yes

Q: If It's known for showcasing important new Irish playwrights., can we say that "Old Mexican artisans are often put on here."?

A: no

Q: If It vanished, and the two men were also gone., can we say that "The men had left long before it vanished. "?

A: it is not possible to tell

Q: If Ah, but you don't know Flossie., can we say that "Flossie is not known by many people."?

A:
it is not possible to tell