Question

ده سال پیش که مریض شد باید بهش کمک میکردید

Answer 1

You should have helped him ten year ago when he got sick

Your should have/ must have helped him when he/she got sick ten years ago

Comments

اگه بنویسید you must have helped him، یعنی گوینده تصور می‌کنه حتماً این طور شده.