How can i tell that it is "alvenos" and not "alvenas"
Since we're using "when" we're clearly talking about either a past or a future action.
The past of "to arrive" is "arrived" though, thus it must be a future action.
It's a one time event in the future.
"Kiam vi alvenas" would refer to a repeating event:
"Kiam vi mangxas cerealajxon uzu kuleron" - when you eat cereal, use a spoon.
I still think that this should be Tiam kiam…
Colloquially the "tiam" is often dropped
But it's so fun to say… :/
Feel free to say it, then :)
It should at least be accepted as an alternative in this sentence, I think, if it's not.
I like the choice that says, "SMSu al mi!".
Ĉu SoMoSu min?
More like "somoSOu"
sounds like that deep fried Indian food... somosa
They sell samosa at Esperanto of Saratoga Springs. I had one just after ARE this year. Yummmm.