How would you communicate with ETs?
Are we asking the wrong question, given that we are searching for intelligent life (SETI)?
Recall that it is only very recently that mankind developed such techniques as we have for extraterrestrial communication (radio, for example), beyond simple eyesight. If one were to "rank" the technological abilities of all the various life-forms (however many there may be) able to communicate across space, we earthly humans, being the neophytes, would rank at the very bottom of the bell curve. The vast majority of the others would be, by longer-extended study and experience, far more able than we to communicate over vast gaps of space and gaps of culture.
It follows that our efforts are better devoted to studying how to detect their communications, not on how to develop our own. The proper question, I'd think, is not, "How would you communicate with ETI's?" but rather "How would ETI's
