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.
In Shakespeare's "Hamlet," the titular character warns his friends not to worry about his behavior when they see him next, particularly after he feigns madness. He reassures them that although he may act strangely, it is all part of his plan to uncover the truth behind his father's murder. Hamlet emphasizes that his unusual demeanor should not be a cause for concern, as it is a deliberate act to achieve his goals.
Sewing
No, Gertrude is lying as Hamlet suggested she should.
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
Shortly after midnight.
Sewing
Horatio finds Hamlet asleep in the middle of a dirt road.
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.