"¿Él es estudiante?"
Translation:Is he a student?
Although English requires an indefinite article before one's occupation, Spanish does not.
It is more often used when the occupation has an adjective to describe it: Él es un estudiante inteligente. Ella es una médica muy simpática.
In addition to occupation, also nationality, religion, social roles (housewife, student), identity. https://www.realfastspanish.com/grammar/spanish-articles
The sentence is a question. "el es un estudiante" is more of a statement. While it can also be used as a question, the phrase "el es estudiante?" more directly translates to "is he a student?".
Yes, Unfortunately, DL tends to use the indicative sentence structure for questions rather than the more standard inverted order that Spanish uses. In both English and Spanish, the indicative structure relies on rising intonation at the end of the sentence.
It asked me what one two three was, Image link https://docs.google.com/document/d/1DF3QnzokiT83CwIds3P2_y6miXaDzdNeml9BeH5pKwY/edit?usp=sharing