Поставить предложения сначала в отрицательную форму а потом в вопросительную 1)he sang 2)he saw an ant 3)winter came 4)i worked all summer

1) He didn't sing. Did he sing?
2) He didn't see an ant. Did he see an ant?
3) Winter didn't come. Did winter come?
4) I didn't work all summer. Did you work all summer?

He did not sing-отрицательная форма Did he sing?- вопрос
He didn't see an AntDid he see an Ant?
Winter did not come    Did winter come?
I did not work all summerDid I work all summer?