Hamlet swears Horatio to two things. What are they? Hamlet asks Horatio to defend him in battle and to kill Claudius if he (Hamlet) does not do it first.

Hamlet asks Horatio to promise to protect his mother, and to defend the country against Fortinbras.

Hamlet asks Horatio not to reveal the events of the evening, and to go along with him (Hamlet) if he pretends to be crazy.

Hamlet asks Horatio to promise to attend Mass for him everyday for a year if he dies, and to marry Ophelia.

Something bad is in the airsomething bad is coming. Something bad is going to happen.

Remember to obey the ghost.

Watch the King. If he shows remorse, let me know. If he does not show remorse, then should I kill him?

Explanation:

It is interesting to note that Claudis is crying out for help as he dies.

Hamlet does not want Horatio to ever talk about seeing the ghost. Let Hamlet die knowing about the ghost, but do not speak of it, or they will think you are crazy too. Stay alive.

the characters in string all have major secrets that they strive to avoid revealing throughout the play.