Examples:
* The cat is in the box.
* The book is on the table.
* I'm in a meeting.
* She's in love.
In can also be used to indicate direction or movement.
Examples:
* The car is going in the wrong direction.
* Please come in.
In can also be used to introduce a clause or phrase that provides additional information.
Examples:
* The woman in the red dress is my sister.
* In other words, I don't agree.
In can also be used to form idioms and expressions.
Examples:
* In a nutshell, the plan is to succeed.
* We're all in this together.