YOU SAID:
the sentence I’m telling you is a lie
INTO JAPANESE
私があなたに言っている文は嘘です
BACK INTO ENGLISH
The sentence I am telling you is a lie
INTO JAPANESE
あなたに言っている文は嘘です
BACK INTO ENGLISH
The sentence you are telling is a lie
INTO JAPANESE
あなたが言っている文は嘘です
BACK INTO ENGLISH
The sentence you are saying is a lie
INTO JAPANESE
あなたが言っている文は嘘です
BACK INTO ENGLISH
The sentence you are saying is a lie
That didn't even make that much sense in English.