Задать вопросы: общий, альтернативный, специальный, вопрос к подлежащему, разделительный
They had breakfast at 8 o’clock every morning

Ответ:

They had breakfast at 8 o’clock every morning

Did they have breakfast at 8 o’clock every morning?

Did they have breakfast or lunch at 8 o’clock every morning?

When did they have breakfast ?

Who had breakfast at 8 o’clock every morning?

They had breakfast at 8 o’clock every morning, didn`t they?