Respuesta :

The event in Act IV that foreshadows Macbeths eventual downfall is when Lady Macduff and her children are murdered.
Foreshadow's just means to predict which I know is tricky vocabulary and it  can be confusing but I hope that makes it easier to understand.
Hope I helped, let me know if you need anymore help or further explanation! :)

Answer: Macduff Discover Macbeth has murdered his family and vows to kill Macbeth himself

Brainiest answer?