蜀西路399号:英语题 高手帮忙啊

答案应该为
is he？
didn't she?

具体原因我想你看完下面这一段就应该很清楚了

与复合句有关的反意疑问句
（1）一般来说，如果陈述部分是主从复合句，其反问部分的主语和助动词应与主句的主语和助动词保持一致。（因为这种复合句的重点在主句。）例如：
If he hasn’t finished his work,
he can’t go out to play, can he?
（2）但是，以第一人称 (I / We)+ think /believe / know / imagine / suppose / guess / expect / etc.开头的主从复合句，其疑问部分的主谓语应与从句的主谓语保持一致。（因为这种复合句的重点在从句。）例如：
I think he has arrived at the airport, hasn’t he?
（3）而以第一人称 (I / We)+ don’t + think / believe / know / imagine / suppose / guess / expect / etc.开头的主从复合句，则应将主句中的“否定”还原到从句中处理，即将该主从复合句转换成一个具有否定含义的单句来考虑。例如：
I don’t believe she knows it, does she? （思路：I don’t believe she knows it.  I believe she doesn’t know it.  She doesn’t know it.）
（4）不过，以第二、三人称 + think / believe / know / imagine / suppose / guess / expect / etc.开头的主从复合句，仍视为一般的主从复合句，其反问部分的写法与(1)同。例如：
You believe they will come, don’t you?
He believes they will come, doesn’t he?

引自http://zhidao.baidu.com/question/1604921.html

don't you think he is bad student?
don't you think lucy should help me with my english?

is he?
didn't she?

is he?
doesn't she?

is he? 看宾语从句，因为主句是I think, I believe等；
doesn't she? 看主句，多数含有宾语从句的复合句都是这样改反意疑问句的。

1。is he
2. didn't she?