I hope this properly belongs in culture; I didn't know where else to put it! What are some things that tell a Spanish speaker that a person is a native English speaker? For example, I tend to use the word "demasiado" when talking to my Mexican friends, but I notice that they almost never use it themselves. I also say "pauta" for "guideline" and notice that they never use it themselves. Another one is "concernir," a good word in the dictionary that no native speaker actually uses in conversation. I am also sure that I put the accent in the wrong place in longer words like "farmacia." I wonder what else I am saying that mark me as a foreigner! It works the other way, too. My Spanish speaking friends also tend to pronounce the "i" in words like "mister" and "sister" as though it were a long "e," pronouncing it as "ee." It seems an easy thing to correct, but I of course don't want to criticize their otherwise excellent Spanish.