YOU SAID:
You're a sitting duck
INTO JAPANESE
あなたは座っているアヒルです
BACK INTO ENGLISH
You are a duck sitting
INTO JAPANESE
あなたはアヒルに座っています
BACK INTO ENGLISH
You are sitting on a duck
INTO JAPANESE
あなたはアヒルに座っています
BACK INTO ENGLISH
You are sitting on a duck
That didn't even make that much sense in English.