Esperanto is changing through the real language use, although it has the core that must not be changed. In this sense, Esperanto is more like natural languages than is generally imagined. Typologically, Esperanto is regarded as agglutinative. The canonical word order is SVO, but it allows fairly free word orders. 1.2 Basic Grammar Words, except the closed class of pronouns, prepositions, and so forth, have each fixed ending.
Adverbs end with -e .
These fixed endings, having the contrast of nominative and accusative cases and the agreement between nouns and adjectives, admit the fairly free word orders without causing misinterpretation. Mi amas vin. Mi vin amas. Vin mi amas. Vin amas mi.