YOU SAID:
when soccer players kick, they kick hard unless they are three years old
INTO JAPANESE
サッカー選手が蹴るとき、彼らは3歳でない限り激しく蹴る
BACK INTO ENGLISH
When soccer players kick, they kick hard unless they are three years old
INTO JAPANESE
サッカー選手が蹴るとき、彼らは3歳でない限り激しく蹴ります
BACK INTO ENGLISH
When soccer players kick, they kick hard unless they are three years old
That didn't even make that much sense in English.