ما اعراب كان المعلمون مجتمعين ؟

The sentence “The teachers were gathered” is analyzed as follows: “كان” is a past tense verb with a fatha vowel. “المعلمون” is a nominative noun, marked by a connecting “و” because it is a sound masculine plural. “مجتمعين” is a predicate in the accusative case, marked by a “ي” because it is a sound masculine plural.