去 (Kanji for past tense)

Onyomi

KYO, KO

ー Keep Your Own KOdomo in the past, Don't let him grow up and lose his innocence.

In the past, I decapitated ten cows. But that's all behind me now. I'm a changed man. That is to say, I'm now a woman.

( を ) さ＊る

to leave (as in leave while others stay). also to be xxx miles away from a particular place.
★☆☆☆☆

過去(かこ)	the past ★★★★★ 過 (surpass / too much) + 去 (past tense) = 過去 (the past)
去年(きょねん)	last year ★★★★★ 去 (past tense) + 年 (year) = 去年 (last year)
過去形(かこけい)	the past tense ★★★★☆ 過去 (the past) + 形 (form) = 過去形 (the past tense)

In the past, moocows lived UNDER the earth,

until they finally migrated ABOVEground.

The tunnels were filled up with the LEGS of the migrating cows.