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Prepositions

A preposition is a word that expresses a relationship between one noun or noun phrase and another word or element in the same sentence:

Trans la riveron kaj tra la arbaron, ĉe Avinon ni iras. Over the river and through the woods, to Grandmother’s house we go.
Violoni dum Romo brulas To fiddle while Rome burns
Ne kun vulpo. Ne en skatolego. Nek kun muso aŭ en domego. Not in a box. Not with a fox. Not in a house. Not with a mouse.

In Esperanto, prepositions never end a sentence, as they often do in English:

Pro kio vi faris tion? What did you do that for?
Pri kio estas ĉi tiu filmo? What is this movie about?

There is also an “anything” preposition in Esperanto, je, which has no definite meaning of its own but is used when no other preposition seems appropriate:

je la nomo de paco in the name of peace
esti graveda je ĝemeloj to be pregnant with twins