YOU SAID:

As long as my child, you let me down.

INTO JAPANESE

私の子供である限り、あなたは私をがっかりさせました。

BACK INTO ENGLISH

As long as you are my child, you have let me down.

INTO JAPANESE

あなたが私の子供である限り、あなたは私をがっかりさせてきました。

BACK INTO ENGLISH

You have let me down for as long as you have been my child.

INTO JAPANESE

あなたが私の子供である限り、あなたは私をがっかりさせてきました。

BACK INTO ENGLISH

You have let me down for as long as you have been my child.