Only the second sentence is correct in peninsular Spanish. In some Caribbean varieties and among Caribbean expats in the USA, though, the first one seems to be the usual form, but that is due to the influence of English. That dialectal trait aside, the Spanish construction is not parallel to the English one. In English, subject auxiliary inversion is forbidden in indirect questions like yours: you must say "I won't tell you where he goes", not "*I won't tell you where **does he go". In Spanish, on the contrary, subject-verb inversion is mandatory in all questions, indirect or direct, unless the question focuses on the subject: we say "¿Quién ha llamado?, not *"¿Ha quien llamado?; "No sé quién ha llamado", not "*No sé ha quién llamado". In subject-focus questions, therefore, the Spanish construction is exactly as in English, and for the same reasons. In all other questions it differs as explained. Let me add a detail, just in case: There is a subordinate context, however, in which you NEED NOT(but still can!) invert the subject and the verb: RELATIVE clauses, as in "El lugar a donde mis amigas van no me gusta", which is acceptable, along with "El lugar a donde van mis amigas no me gusta", but the latter is more natural (because "mis amigas" is a more likely information focus than "van"). Notice, however, that in relative clauses "a donde" bears WEAK stress (and no orthographic stress); so it is very different from interrogative "a dónde". I mention this fact just in case you do not yet understand well the difference between indirect questions and relatives. Anyway, for a relative clause like that most speakers prefer to say "El lugar AL QUE van mis amigas no me gusta" (or "El lugar AL QUE mis amigas van no me gusta"), which removes all possible ambiguity that might arise from the use of "a dónde"/"a donde".

Las dos oraciones se entienden y podrían utilizarse. No obstante, es más correcta y habitual decir: "No te digo adónde va él". Lo normal, incluso, es utilizar únicamente "No te digo adónde va" (él o ella, 3ª persona) se sobreentiende, y se omite generalmente en el español cotidiano.

Ambas se entienden y son correctas. Pero tal como menciona Leandroadolfo, la segunda es mas habitual. >> "No te digo adonde va él" Un detalle. En este caso, la palabra "adonde" no debe llevar tilde ya que no es una pregunta. En resumen: > "Adónde va él?"; < "No te digo adónde va él";

¡No te digo adónde va él!. Es correcta, aunque ambas frases significan lo mismo. "I don't say you where he goes"!. Nota: "Adónde" con tilde, es un adverbio interrogativo o exclamativo, pero a veces se usa en oraciones subordinadas interrogativas o exclamativas indirectas.

For me the best Will be No te diré a donde va el