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In page Esperanto grammar:

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East Asian languages may have had some influence on the development of Esperanto grammar after its creation. The principally cited candidate is the replacement of predicate adjectives with verbs, such as la ĉielo bluas (the sky is blue) for la ĉielo estas blua and mia filino belu! (may my daughter be beautiful!) for the mia filino estu bela! mentioned above.[citation needed] However, this regularization of existing grammatical forms was always found in poetry; if there has been an influence of an East Asian language, it has only been in the spread of such forms, not in their origin. Such usage is not entirely unknown in Europe: Latin has an analogous folium viret for folium viride est (the leaf is green) and avis rubet for avis rubra est (the bird is red).