Okay, here is an English summary of the plot for the movie Spider-Man 3 (2007):
Plot Summary: Spider-Man 3
Peter Parker's life seems to be reaching a peak. He's living with Mary Jane Watson, he's just been accepted to Harvard University, and he's about to propose. However, this period of happiness is short-lived. A new villain emerges: the notorious Sandman (Michael Keaton), real name Flint Marko. Sandman has the ability to transform his body into sand, granting him immense strength and shape-shifting abilities. He escapes from a maximum-security prison and begins a series of destructive robberies, causing chaos in New York City.
As Sandman's crimes escalate, Peter's life becomes increasingly complicated. He faces intense pressure from his demanding boss, Mr. Ditko, and struggles to balance his personal life with his responsibility as Spider-Man. Meanwhile, his relationship with Mary Jane is tested when she discovers his secret identity. Adding to the turmoil, Peter's old friend Harry Osborn returns, visibly changed and troubled after a mysterious accident at Oscorp. Harry suspects his father, Norman Osborn (the Green Goblin from Spider-Man 2), might still be alive.
Matters come to a head when Peter is confronted by both Sandman and Harry Osborn. In a confrontation at the Brooklyn Bridge, Peter is severely injured, losing the use of his powers after being struck by a truck (which Harry drives). With no superhuman abilities, Peter must rely on his wits to fight Sandman, who has taken Mary Jane hostage at the top of the Empire State Building.
During the desperate battle, Harry reveals that Norman Osborn is indeed alive and has been kept in a vegetative state due to the experimental serum that made him the Green Goblin. Consumed by grief and a desire for revenge, Harry injects himself with the remaining Goblin formula, transforming into the new Green Goblin. He saves Peter from Sandman, but then turns on him, wanting to take over as Spider-Man.
The climax occurs on the bridge, where Peter and Harry, both now wielding Goblin technology, engage in a final, epic battle. Peter, fighting without his powers, uses his intelligence and experience to outmaneuver Harry. Ultimately, Peter forces Harry to fall into the East River, saving his life but also causing him to drown.
With Harry gone and the Green Goblin threat eliminated, Peter makes a heart-wrenching choice: he throws the Goblin glider into the river, symbolically ending his Spider-Man identity to focus on his personal life and responsibilities with Mary Jane and Harvard. He tells Mary Jane he can't be with her while he's Spider-Man.
The film ends with Peter driving away from Mary Jane's apartment, the weight of his decision heavy on his shoulders, as he reflects on the price of being a hero. Sandman escapes in the chaos, leaving the future uncertain.
