1. Peter’s sister teaches law.2.They always have breakfast at home.3. Make the following sentences interrogative.

Question

Всеволод · Accepted Answer

Насколько я поняла, третье предложение - это задание. 
1. Peter’s sister doesn't teach law. 
2.They never have breakfast at home.

Вадим · Answer

Вот вам комплект разных вопросов. Кушайте на здоровье. 
1) Does Peter's sister teach law? Who teaches law? What does Peter's sister teach? Peter's sister teaches law, doesn't she? Does Peter's sister teach law or English? 
2) Do they always have breakfast at home? Who has breakfast at home? Where do they always have breakfast? They always have breakfast at home, don't they? Do they always have breakfast or dinner at home?