Answer:
In order to prove negligence you have to show:
* Duty of care: the defendant must have had a reasonable duty to avoid causing injury to another.
* Breach of duty: the defendant failed to carry out their duty to avoid injury to the plaintiff.
* Cause: there must be proof that the defendant's breach of duty caused the injury.
* Damages: it must be proven that damages occurred as a result of the plaintiff's breach of duty.
Below is an article on proving negligence.