We played football yesterday afternoon.否定：We didn't play football yesterday afternoon一般疑问：Did you play football yesterday afternoon?肯定回答：Yes, we did.否定回答：No, we didn't.
Nancy went to school early yesterday morning.否定：Nancy didn't go to school early yesterday morning.
一般疑问：Did Nancy go to school early yesterday monring?肯定回答：Yes, she did.否定回答：No, she didn't.
They sang some English songs yesterday,否定：They didn't sing English songs yesterday,
一般疑问：Did they sing any Englsih songs yesterday?肯定回答：Yes, they did.否定回答：No, they didn't
放心采纳,(*^__^*) 嘻嘻……