YOU SAID:

I was drinking tea when my tea spilled on the carpet

INTO JAPANESE

じゅうたんにお茶がこぼれたとき、お茶を飲んでいました

BACK INTO ENGLISH

I was drinking tea when the tea spilled on the carpet

INTO JAPANESE

じゅうたんにお茶がこぼれたとき、私はお茶を飲んでいました

BACK INTO ENGLISH

I was drinking tea when the tea spilled on the carpet