1 The attributive clauses are build with copulative verbs (ser y estar) or half-attributive (parecer, resultar, quedar y llegar). If an adjective or past participle follows this type of verbs, the adjective must agree with the subject. The adjective and the past participle are attributes.
La casa es blanca. (Copulative verb)
Isabel está disgustada. (Copulative verb)
La casa parece vacía. (Half-attributive verb)
Diez personas resultaron heridas. (Half-attributive verb)
2 Some intransitive verbs (andar) also link the subject and an adjective.
Él andaba enamorado de Isabel. (= Él estaba enamorado de Isabel.)
¿Manuel anda por aquí? (= ¿Manuel está por aquí?)
In the former clauses, the verb andar loses its original meaning and acts as link between subject and attribute. Other verbs of motion also may appear with adjectives or past participles in agreement with the subject; but in this case, the verbs retain their original meaning.
Los pájaros volaban majestuosos.
Las ovejas iban lentas.
The adjectives majestuosos and lentos could be replaced by the adverbs majestuosamente and lentamente, respectively.
3 Some verbs admit attribute in agreement with the direct object: considerar, juzgar, encontrar, etc.
Juzgo esta solución inadecuada. formal
Juzgo inadecuada esta solución. formal
Carlos considera tu sugerencia estúpida. formal
Carlos considera estúpida tu sugerencia. formal
Encontré a tu prima muy cambiada.
Encontré muy cambiada a tu prima.
The three previous examples may be rephrased as follows:
Juzgo que esta solución es inadecuada.
Carlos considera que tu sugerencia es estúpida.
Encontré que tu prima estaba muy cambiada.
They are, in fact, subordinate substantive clauses where the conjunction que and the copulative verb are omitted.