YOU SAID:
i shat my pants yesterday night.
INTO JAPANESE
私は昨夜ズボンを脱ぎました。
BACK INTO ENGLISH
I took off my pants last night.
INTO JAPANESE
私は昨夜ズボンを脱いだ。
BACK INTO ENGLISH
I took off my pants last night.
That didn't even make that much sense in English.