They were in London with their teachers
Они были в Лондоне с их учителями.-перевод
They were not in London with their teachers-отрицание
Were they in London with their teachers?-общий вопрос
They were in London with their teachers, were not they?- разделительный вопрос
Were they in London with their teachers or parents? -альтернативный вопрос
Who was in London with their teachers?-вопрос к подлежащему