Esperanto fell well short of zamenhof's goal of a universal second language, but it was not a complete failure.
The exercises are taken chiefly from the "Ekzercaro" of Dr. zamenhof.
La Revuo (which enjoys the constant collaboration of Dr. zamenhof).
The following is what Dr. zamenhof has written on the subject in the "Esperantisto."
Some writers use ajn after other correlatives, but Dr. zamenhof himself has rarely used it except after the series kia, kial, etc.
In the Fundamento, zamenhof used capital letters to begin the names of months.
zamenhof states that the "ablative absolute" does not exist in Esperanto, as its use would be against the spirit of the language.
On leaving the university, Dr. zamenhof commenced his medical practice, and began to consider the publication of his language.
But at the first congress zamenhof announced that he had given up even this control, and Esperanto is now a free language.
As an example Dr. zamenhof gives the following sentence: "Mi ne sci'as kie mi las'is la baston'o'n: Ĉu vi ĝi'n ne vid'is?"