Lulu was at school yesterday mor-ning :
Lulu wasn't at school yesterday morning .
Was Lulu at school yesterday morning?Yes,she was.
l went the bookstore yester-day:(此句说法有点问题）
l didn't go to the bookstore yester-day.
Did you go to the bookstore yester-day?No,i don't.
再问： 你确定对？不对，老师K我
再答： 把单词中的连字符去掉。 Did you go to the bookstore yester-day? No, i don't 这句打快了，应把答句的中don't 改为didn't. 其余确定，