In is used to denote things at rest.
The material is in the water.
The manager is in the office.
Into is used to denote things at motion towards the inside of something.
The boy fell into the water.
They jumped into the river.
The material is in the water.
The manager is in the office.
Into is used to denote things at motion towards the inside of something.
The boy fell into the water.
They jumped into the river.
