I DON'T THINK IT'S A GOOD IDEA.(改为反义疑问句)改过来是 I DON'T THINK IT'S A GOOD IDEA,IS IT?为什么不是DO

I DON'T THINK IT'S A GOOD IDEA.(改为反义疑问句)改过来是 I DON'T THINK IT'S A GOOD IDEA,IS IT?为什么不是DO
I DON'T THINK IT'S A GOOD IDEA.(改为反义疑问句)
改过来是 I DON'T THINK IT'S A GOOD IDEA,IS IT?为什么不是DO

I DON'T THINK IT'S A GOOD IDEA.(改为反义疑问句)改过来是 I DON'T THINK IT'S A GOOD IDEA,IS IT?为什么不是DO
is it?这个句子前面其实是个否定前移,
 
正常是it's a good idea 这个句子表否定,
 
所以反义疑问句要用肯定形式.