That is a good point, wrholt! The linking verb 'to be' in English is always expressed with 'ser' in Spanish. So if you recognize that you're using a linking verb (and a subject and predicate noun or a predicate adjective) in English, you should use 'ser' in Spanish.
In phrases like 'soy estudiante', 'estudiante' is a defining characteristic. It's a predicate noun, and 'ser' is the linking verb.
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