Example: the children are left after the lessons.(why,how often) – why are the children left after the lessons? —how often are the children left after the lessons? 1.the dinner is not yet served, (why) . 2.new rules are explained at the lesson, (by whom)
By whom new rules are explained at the lesson-Кто обьяснял новые правила на уроке(кем были объяснены новые правила на уроке)
2. By whom new rules are explained at the lesson?