Thou, wretched boy, that didst consort him here, Shalt with him hence.
This shall determine that.
The scene where Romeo first lays his eyes on Juliet is of great importance to Act I because it is what begins their love story.
ACT III
O, I am fortune's fool!
And for that offenseImmediately we do exile him hence.
This scene when Romeo and Juliet meet at the balcony is important because it is where they found out how they felt about each other, and it is also where they decided to get married.
ACT IV
O woe! O woeful, woeful, woeful day!
Dead art thou--alack, my child is dead!
The fight between Romeo and Tybalt is important to the story because Tybalt is Juliet's cousin, and Romeo killing him would make matters worse for both himself and Juliet.
ACT V
And I, for winking at your discords too, Have lost a brace of kinsmen. All are punished.
Romeo's banishment is a key part to the story because he is exiled out of his home where Juliet lives, making it very difficult for the two to be together.
The scene of Juliet's "death" is important because Juliet took the potion earlier than the Friar had expected, which messes up the Friar's entire plan.
Romeo and Juliet's deaths ends the story with the two families setting aside their differences to end their everlasting feud with one another due to both sides losing a loved one.
For never was a story of more woeThan this of Juliet and her Romeo.