回答

(1)
① Did you help your mother yesterday?
② You didn't help your mother yesterday.
(2)
① Did John walk in the park?
② John didn't walk in the park.
(3)
① Did he go to the park yesterday?
② He didn't go to the park yesterday.
(4)
① Did Bob know the news?
② Bob didn't know the news.

参考にしてください。

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