TASK DEFINITION: In this task, you are given a sentence which contains a motion and your task is to identify the physical entities involved in the motion. The input sentence can have more than one entity and also there is at least one entity that takes part in physical motion. There are two types of entities which are animate (beings that are alive) and inanimate entities (beings that are not alive).
PROBLEM:  A little boy goes behind a ladder and other people keep walking around.

SOLUTION: boy

PROBLEM: When Katharine was inside the room he shut the study door carefully behind him as if to secure himself from something that he disliked.

SOLUTION: he

PROBLEM:   A group of people on a blue water raft paddle against a violent stream/body of water.

SOLUTION:
people