Learn Hardcore Esperanto: Mi lernas Esperanton sen libro.

In Esperanto, the “-n” is added to the noun “Esperanto” to indicate that it is the direct object of the verb “lernas.” This accusative ending clarifies which part of the sentence receives the action.

Why doesn’t “libro” have an “-n” ending even though it seems to be part of the object?

Although “libro” appears in the sentence, it follows the preposition “sen” rather than serving as the direct object of the main verb. In Esperanto, nouns that come after prepositions remain in the nominative form and do not take the accusative “-n.”

What does the preposition “sen” mean, and how is it used here?

The preposition “sen” means “without.” In the sentence “Mi lernas Esperanton sen libro,” it introduces the idea of doing something without the aid of a book. It is always followed by a noun in the nominative case.

Why is there no article before “libro” in the phrase “sen libro”?

Esperanto does not use an indefinite article equivalent to the English “a” or “an.” Although it does have the definite article “la,” it is only used when referring to something specific. In this case, “libro” is used in a general, indefinite sense, so no article is needed.

Is the word order in “Mi lernas Esperanton sen libro” fixed, or can it be rearranged?

Esperanto generally follows a subject–verb–object order; however, thanks to the clear accusative marking, the word order is flexible. The essential roles of the words remain clear even if the order is slightly adjusted.