Question

I don't believe that her son has the ability to go to univer

Answer 1

I don't believe that her son has the ability to go to university, has he?

解析：I (don't )think, I (don't) believe, I (don't) suppose 等句型的反意疑问句要反意从句.

（其中主语I 也可以换成We. 其它复合句都是反意主句.）