1.You have sent out the letter,haven't you?
2.The library opens at 8 o'clock,doesn't it?
3.She left the city one week ago,didn't she?
4.There are some footprints on the road,aren't there?
5.The students didn't hear about this story before,did they?
6.We hardly thought that he could succeed in this entrance examination,did we?
注:反意疑问句后面的助动词取决于前面句子中的实义动词形式.前面句子中带有否定意思的,反意疑问句中用肯定形式,如5和6.