Hamlet tells his mother Queen Gertrude that she must repent choosing Claudius over his father. This occurs in Act 3 scene 4 of Hamlet.
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)
He asks them to swear not to tell about the ghost's visit and why Hamlet may appear crazy.
The beginning plot of Hamlet ended in the last scene of Act 5.
Marcellus says that there is something rotten in the state of Denmark while Hamlet leaves to meet the ghost dragging the dead body of Polonius with him. Gertrude watches him leave as she reports that Ophelia has just died. But perhaps it would be clearer if we knew which of the three scene 4s in Hamlet we were talking about.
In Act IV Scene iv Hamlet runs into Fortinbras's army, and after a chat with a captain of that army realizes at the end of a long soliloquy that if his thoughts are not violent then they are completely WORTHLESS.
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)
i dun kno you tell me :P
Well, a lot of people: Hamlet, Claudius, Gertrude, and Laertes.
He asks them to swear not to tell about the ghost's visit and why Hamlet may appear crazy.
Not at all. Polonius ends it, first by ordering Ophelia to stop communicating with Hamlet, and second by using Ophelia as a tool to get at Hamlet. Gertrude was favourable to the romance; at Ophelia's funeral she says "I hoped thou would have been my Hamlet's wife."
He speaks to the ghost of his father, which she cannot see.
Avenge his death
The beginning plot of Hamlet ended in the last scene of Act 5.
He did, at the end of Act V.
Hamlet suggests that he may act crazy. The audience does not know how Hamlet will avenge his father's death. It is not yet known whether Hamlet will fulfill his father's wish.
no
The end of Act One follows the visitation of the Ghost. Hamlet is visibly shaken and possibly mad by the end of the act. The ghost has given him a mandate to act; Hamlet must now take steps to complete that action or reject the ghost altogether.