含否定前移和从句的反义疑问句~

问题描述:

含否定前移和从句的反义疑问句~
比如
I don`t think he is right,____?
还有
I don`t think Joe could have done a stupid thing last night,___?
到底有什么语法现象?

如果主句谓语为实义动词 ,后面借助助动词 do/does+主语;谓语为系动词,后面用be(am is are)+主语;如果主语为第一人称,反意从句;如果主语为二三人称,反意主句.