I have always found prepositions to be a fishy part of grammar in English.
Suppose we have a train, a bus, a car, a plane, a ship, a boat.
We can either say:
- To get in the train (bus, car, plane, ship, boat).
- To get into the train (bus, car, plane, ship, boat).
- To get on the train (bus, car, plane, ship, boat).
But what is the big difference between them.
As I feel it:
- "in" shows location and firstly means to get inside of them.
- "into" shows motion rather than the location.
- "on" means to board. But you cannot board "a car" for instance, so it doesn't always work.