I think you must know the answer to this better than anyone here. Maybe it's because you find the gravediggers funny. Maybe it's because you like Hamlet's dirty jokes.
You cannot see the ghost hamlet
Hamlet: My father! Methinks I see my father! Horatio: Where, my lord? Hamlet: In my mind's eye, Horatio.
Sewing
No, Gertrude is lying as Hamlet suggested she should.
The Murder of Gonzaga is the name of the play Hamlet uses to see if his uncle is guilty of killing his father.
You cannot see the ghost hamlet
Hamlet: My father! Methinks I see my father! Horatio: Where, my lord? Hamlet: In my mind's eye, Horatio.
Ophelia's father, Polonius, forbade her from continuing to see prince Hamlet.
The ghost of Hamlet's father, the former king.
Yes the ghost only speaks to Hamlet. The others can see him but cannot hear him. When the ghost visits Hamlet in his mother's closet, his mother can neither see nor hear him.
Hamlet. See http://www.opensourceshakespeare.org/views/plays/play_view.php?WorkID=hamlet&Act=1&Scene=1&Scope=scene
Horatio finds Hamlet asleep in the middle of a dirt road.
Shortly after midnight.
Sewing
It is already.
Polonius is interested in seeing whether spying on Hamlet's conversation with Gertrude will justify his theory that Hamlet is mad for love. (see the end of Act 3 Scene 1)
No, Gertrude is lying as Hamlet suggested she should.