Question vs. Statement
How would someone hearing the Spanish sentence know that it is a question rather than a statement?
2 Answers
Questions that can be answered by a "yes" or "no" can be stated as Ray has said.
Example. ¿Rosa canta en el coro de su iglesia? Raising your voice at the end will get the idea that it's a question.
You can't go wrong by putting the verb FIRST. ¿Canta Rosa en el coro de su iglesia?
There are other questions that are obvious because they start with a question word.
¿Dónde está Pablo?
¿Cuándo es la fiesta?
¿Cómo se llama el profesor de álgebra? and so forth. These questions, however, are said by dropping the vocal pitch slightly at the end.
Hello!
This link might be the answer to your question. Asking Questions in Spanish
Hope this helps.
Regards!