Could you also say "Kiel oni diras tion Esperante?"
What is the difference between Ke and tio ?
They both mean "that", i mean.
"tio" is a pronoun (like German "das" with one S) and "ke" is a conjunction (like German "dass" with two S).
Since you also know some French and Spanish, "ke" is similar to "que" in those languages in its use as a conjunction.
you made it clear, dankon :D
How does one respond to this question? Here's my guess, am I wrong?
Oni diras tion tiel <la frazo>
Oni diras ke, [la frazo].