.I feel like this analogy doesn’t entirely work because you always know where the question starts, as that’s where the sentence startS.
Not always. For example (translated):
And you, ¿how are you?
You could write that as "And you? How are you?" so both parts of that sentence are still a question.
However there are other examples where you're right: ",That's not going to happen, ¿or is it?"
I feel like the first example in your comment implies a different intonation than it's equivalent in PooloverNathan's comment. Also I feel the need to admit that I first read ¿)Nathan's(? username as "Pool-over" as in "pull over"...
Not always. For example (translated):
You could write that as "And you? How are you?" so both parts of that sentence are still a question.
However there are other examples where you're right: ",That's not going to happen, ¿or is it?"
I feel like the first example in your comment implies a different intonation than it's equivalent in PooloverNathan's comment. Also I feel the need to admit that I first read ¿)Nathan's(? username as "Pool-over" as in "pull over"...