I've often wondered how to use "ties" in "normal usage, Thank you.
What does speech mean in this example? Is it a speech as in a speech one gives, or does it mean one's manner of speaking?
The Esperanto means 'manner of speaking', or maybe more precisely 'act of speaking'.
Since tiu and tio know an accusative (tiun and tion), shouldn't ties know one too? But how could you make an accusative out of it? Is that why there isn't one, because you can't say "tiesn" properly?
No. Ties doesn't take any endings. It's a lot like la in many ways.