1、We didn't visit the science museum yesterday.
Did you visit the science museum yesterday?
Yes,we did.
2、Mr.Wang didn't teach us math last year.
Did Mr.Wang teach you math last year?
Yes,he did.
3、The trip wasn't exciting.
Was the trip exciting?
Yes,it was.
4、The strawberries weren't delicious.
Were the strawberries delicious?
Yes,they were.