YOU SAID:

The piano has been drinking

INTO JAPANESE

ピアノは飲んでいる

BACK INTO ENGLISH

I'm drinking the piano.

INTO JAPANESE

私はピアノを飲んでいます。

BACK INTO ENGLISH

I am drinking the piano.

INTO JAPANESE

私はピアノを飲んでいます。

BACK INTO ENGLISH

I am drinking the piano.