While the main conflicts in Shakespeare's Romeo and Juliet involve man vs. man, man vs. society and man vs. fate, there are two instances of man vs. nature. A conflict involving man vs. nature occurs when the characters battle against something in nature that is not caused by human beings.
In Act III, Scene 5, Juliet struggles against nature when she thinks she hears the nightingale, a symbol for the night, singing outside her window. She very much wants the night to last because she is with Romeo on the eve of his banishment from Verona. After killing Tybalt, Romeo must leave or risk apprehension by the Prince and possible death. When Romeo gets up to leave, Juliet implores him to stay:
Wilt thou be gone? It is not yet near day.
It was the nightingale, and not the lark,
That pierced the fearful hollow of thine ear.
Nightly she sings on yond pomegranate tree.
Believe me, love, it was the nightingale.
Going to find a barefoot brother out,
One of our order, to associate me,
Here in this city visiting the sick,
And finding him, the searchers of the town,
Suspecting that we both were in a house
Where the infectious pestilence did reign,
Sealed up the doors and would not let us forth,
So that my speed to Mantua there was stayed.