Question

When can the upside-down question mark be used in the English language?

Answer 1

Only if there's a direct quote from a language that uses the ¿

Explanation:

An upside qustion mark at the beginning of a question is very useful, as it shows the reader that the tone should go up at the end of the sentence. This is especially useful when reading a text out loud.
Only a few languages use the ¿