Questions & Answers about Ne ĵetu ŝtonon en la fonton.
The ending -u is the Esperanto verb ending for a command, request, wish, or instruction.
So:
- ĵeti = to throw
- ĵetu = throw! / should throw / let ... throw
In this sentence, Ne ĵetu ... means Don't throw ...
This is the normal way to make a negative command in Esperanto:
- Ne parolu. = Don't speak.
- Ne kuru. = Don't run.
- Ne ĵetu ŝtonon en la fonton. = Don't throw a stone into the fountain.
In Esperanto, ne normally goes directly before the thing it negates. In a simple command like this, it comes before the verb:
- Ne ĵetu = don't throw
That is the standard pattern for a negative command.
Compare:
- Ĵetu ĝin. = Throw it.
- Ne ĵetu ĝin. = Don't throw it.