YOU SAID:

it appears that you have spoiled my milk and thus foiled my tea

INTO JAPANESE

あなたが私のミルクをダメにして、私のお茶を駄目にしてしまったようです

BACK INTO ENGLISH

I think you spoiled my milk and spoiled my tea

INTO JAPANESE

あなたが私のミルクを台無しにし、私のお茶を台無しにしてしまったと思います

BACK INTO ENGLISH

I think you ruined my milk and ruined my tea

INTO JAPANESE

あなたが私のミルクを台無しにし、私のお茶を台無しにしたと思います

BACK INTO ENGLISH

I think you ruined my milk and ruined my tea