why, at the end of the Act, does Hamlet say:
The time is out of joint, O cursed spite
That ever I was born to set it right! (1.5.210-211)
In here - http://nfs.sparknotes.com/hamlet - you can choose the act and scene you need. It's much easier to read and understand if you use this website.
http://nfs.sparknotes.com/hamlet/page_74.html
Read the last lines here, in the right column (modern English).