If you have attack and extra attack can you also do a bonus action?

Can a monster take legendary actions while surprised?

Is Flaming Sphere bound to the ground?

Does Disintegrate destroy Forcecage?

Can the PC use the action surge to cast another spell?

Would a fireball cast under water vaporize the water?

Sneak attack+Multiple attacks, if 1st hit but hold sneak to see if 2nd crits…