Question

1)    Как определить, какое окончание следует писать у имени прела -                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       гательного в безударном положении?-

Answer 1

попробуйте задать вопрос от подлежащего

Answer 2

нужно задать вопрос
(Пример:"какое?
светлое"
Видишь окончания совпадают, вот так и определяй.
P.S. удачи