一般疑问句：Did we hear the news on the radio?
否定的回答：No,we didn't
Did you hear the news on the radio?
No, we didn't,
变成疑问句，有情态动词，am is are 的直接提前，没有的直接借助助动词do，一定要注意时态和人称的变化。
Did you hear the news on the radio?
No,we didn't.
Did you hear the news on the radio？
No, we didn't.
Did you hear the news on radio？
We didn＇t hear the news on radio.
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