El concierto es en el teatro principal.
English: The concert is at the main theater.
In Spanish, 'ser' and 'estar' both mean 'to be', but they are used in different situations. At B2 level, you will see more complex contexts where choosing between 'ser' and 'estar' can change the meaning of a sentence.
Use 'ser' for permanent characteristics, identity, origin, professions, and time. Use 'estar' for temporary states, locations, ongoing actions, and results of actions. In complex sentences, the choice between 'ser' and 'estar' can express different meanings or nuances.
El concierto es en el teatro principal.
English: The concert is at the main theater.
El teatro está cerrado por reformas.
English: The theater is closed for renovations.
María es lista.
English: María is clever.
María está lista.
English: María is ready.
Las manzanas están verdes.
English: The apples are unripe.