Inside means to be in a place that is not outside. It is used to talk about something that is in a room or building.
She stayed inside the house all day.
Keep the dog inside during rain.
Inside as a noun means the inner part of something. You use it to talk about the space or area that is contained by something else.
The inside of the box is empty.
Look inside the bag for keys.
Inside as a verb means to move into or place something within the inner part of a place or object. This use is less common and often informal.
She inside the house quickly.
They inside the room after the bell rang.
Inside can mean a person who knows secret or private information about a group or company. They have special access others do not have.
She is an inside at the company.
The inside told us the secret plan.
As a preposition, inside means 'within' a space or time period. It shows something is not outside but contained by something else.
Inside the box, there are toys.
Inside two hours, we will arrive.
Inside used adverbially means acting secretly within a group or situation. It often refers to private or hidden support or actions.
They worked inside to win the vote.
He had inside support from the team.
Inside as an adjective describes something located towards the middle or center of something else, not on the outside edge.
The inside door is broken.
Use the inside path to walk.
