English Translation
How can you tell?
“How can you tell?” The standard translation of “dire” is “to say” or “to tell,” but the word “tell” is used in English in ways that “dire” does cover. In this cloze, “to tell” means “to know” as in “How can you tell he’s lying?” Yes, you could stretch the meaning of this sentence to “How can you say it?” but no English speaker takes that from the context provided. I would advise anyone who wants to say “How can you tell?” in Italian to say “Come può saperlo.”