I don't think it's useful to have support teams,----（反意疑问句）

I don't think it's useful to have support teams,----（反意疑问句）
I don't think it's useful to have support teams,----（反意疑问句）

I don't think it's useful to have support teams,----（反意疑问句）
I don't think it's useful to have support teams,——————is it?
只有think、suppose在第一人称时跟后面的宾语变化,eg：He thinks it is ,doesn't he?
其他的后面带宾从的跟主句变化
前面否定后面肯定

is it

Don't you think it's useful to have support teams ?

is it

is it?