Though he had done so many signs before them (tosauta autou shmeia pepoihkoto emprosqen autwn). Genitive absolute with perfect active participle in concessive sense of poiew. Yet they believed not on him (ouk episteuon ei auton). No "yet" in the Greek. Negative imperfect active of pisteuw, "they kept on not believing on him," stubborn refusal in face of the light (verse Matthew 35 ).