[lalopalota]

> How would would you say "where is the toilet?" more succinctly with the context up front in English?

"Restroom?"

[neom]

We're talking(the article) about forming sentences, not just saying words at people.

[Google234]

https://en.m.wikipedia.org/wiki/High_rising_terminal you can raise the pitch to indicate that you are asking a question

[MichaelZuo]

"Restroom?" is a valid english sentence.

[vineyardmike]

While I agree “restroom?” Is perfectly valid, you could also say “the restroom is where?” Which puts the important noun first and makes it a question later. It’s not particularly formal, which in America at least is completely unnecessary for day to day life.