Final answer:
The basic actus reus of false imprisonment is intentional confinement without lawful justification.
Step-by-step explanation:
The basic actus reus of false imprisonment is intentional confinement without lawful justification. False imprisonment occurs when one person intentionally restricts another person's freedom of movement without their consent and without lawful justification. It involves the intentional and unlawful restraint of a person against their will, without any legal basis or valid excuse.