YOU SAID:

never have I seen a hippo but oh no that wasn't my duck

INTO JAPANESE

私はカバを見たことがないが、ああ、それは私のアヒルではなかった

BACK INTO ENGLISH

I have never seen a hippo but ah it was not my duck

INTO JAPANESE

私はカバを見たことがないが、ああそれは私のアヒルではなかった

BACK INTO ENGLISH

I have never seen a hippo but ah it was not my duck