En
En has many of the same senses as English "in" (in the evening, in a good state, etc.). However, it does NOT have the sense of "into". The phrase Iri en la cxambro means "to go, in the room" but not "to go in(to) the room." We'll see how to say this later.
Information provided by the Esperanto HyperCourse Maintainer as part of the Esperanto HyperCourse.