I would like to know how to correctly compose very complicated verb tenses (more complex than esti+participle). Because their usage is so rare, this is a curiosity question rather than a practical one.
For example, could someone show me (and explain the reasoning behind) the Esperanto equivalent of:
"She will have been about to go to the house, when..."
This is future->past->future again, the best I can think of in Esperanto is:
Ŝi estos estis ironta al domo, kiam... or Ŝi estos estinta ironta al domo, kiam...
Is it better to use two verbs, two particles, or something else entirely? (My apologies if both are awful, I'm fluent in only English, so the lack of so many auxiliaries throws me off)