YOU SAID:

I think that playing piano is pretty difficult

INTO JAPANESE

私はピアノを弾くのはかなり難しいと思います

BACK INTO ENGLISH

I think it's pretty hard to play the piano.

INTO JAPANESE

ピアノを弾くのはかなり難しいと思います。

BACK INTO ENGLISH

I think it's quite difficult to play the piano.

INTO JAPANESE

ピアノを弾くのは難しいと思います。

BACK INTO ENGLISH

I think it's difficult to play the piano.

INTO JAPANESE

ピアノを弾くのは難しいと思います。

BACK INTO ENGLISH

I think it's difficult to play the piano.