Balthasar tells Romeo that Juliet is dead, so he decides to purchase poison from an apothecary.  In the final scene, in just a few pages the action progresses very quickly and the characters recieve their fates, and the final stasis shows hope for Verona.
The main characters are Romeo, Juliet, and Paris.

In act 4 Friar gives Juliet the poison that would make her look dead.  She leaves a knife by her bed just in case the poison didn't work.  This foreshadows what tragedy is in store for Romeo and Juliet.  When Juliet's parents find her they order the music to change to funeral music.
The main characters of this act are Friar Lawrence, Juliet, Lady and Mr. Capulet, and the nurse.
When Juliet says "That may be, sir, when I may be a wife." she is hinting that she is already a wife.  This is foreshadowing.  There are also similes like "And shrieks like mandrakes' torn out of the earth," and "Death lies on her like an untimely frost upon the sweetest flower of all the field."

In this act Romeo kills Tybalt, and the prince exiles Romeo.  This is the first tragedy the young lovers had to face.  Juliet at first is angry but then supports his decision.  The capulet parents discuss when they are going to marry Juliet to Paris.  Juliet is sad that she may never see Romeo again, and her mom thought she was grieving about Tybalt so she said that Juliet was going to marry Paris soon to try to comfort her, but she got even more sad.

In act 2, some of the settings are Juliet's balcony, Friar's chapel and Juliet's house.  This act is mostly about the joy of young love, like when Juliet is so excited  when the nurse pretends to be too tired to tell her what she knows.  There is foreshadowing when friar says "these violent delights have violent ends".
The main characters in this act are Romeo, Juliet, Friar, and the nurse.
Some metaphors in this act are "What light through yonder window breaks," and "Juliet is the sun,".

Right from the beginning of the play, in the prologue it states the ending of the story.  I think most people already know the basic story of Romeo and Juliet, so I don't think it takes away from the story now, but when this play was first written I think I wouldn't have appreciated the spoiler.