How to use "아닌가 싶다"
I'm not sure what it means and how I can use
Thank you in advance :)

Question

Answer

~ 아닌 가 싶다 = It is probably ~ / I suspect ~

(Ex) It is probably ther were right.
         (그들이 옳았던 게 아닌가 싶다.)

I suspect there was some monkey business between them.
        (그들간에 부정한 일이 있었던게 아닌가 싶다.)

Answer

~아닌가 싶다 is used when you express your opinion with uncertainty.

~아닌가 싶다 = I think that S + V but I'm not sure.

나는 그가 범인이 아닌가 싶다 -> I think that he is the criminal but I'm not sure.