YOU SAID:

when my best friend is not home i normally take care of his plants

INTO JAPANESE

私の親友が家にいないとき、私は通常彼の植物の世話をします

BACK INTO ENGLISH

I usually take care of his plants when my best friend is not at home

INTO JAPANESE

私の親友が家にいないとき、私は通常彼の植物の世話をします

BACK INTO ENGLISH

I usually take care of his plants when my best friend is not at home