1cars are repaired at service centresg 2 this vase is made of glass 3 breakfast is served at 8 o'clock 4 oil is made of seeds перевести в отрицательную и вопросительную форму

отрицательную
1 Cars are not repaired at service centres.
2 This vase is not made of glass.
3 Breakfast is not served at 8 o'clock.
4 Oil is not made of seeds.
вопросительную
1 Are cars repaired at service centres?
2 Is this vase made of glass?
3 Is breakfast served at 8 o'clock?
4 Is oil made of seeds?