关于When引导的状语从句,省去主谓的问题.

关于When引导的状语从句,省去主谓的问题.
是主句和从句的主谓都一样的时候,when引导的从句可以省去主谓；还是when引导的从句主语和主句一样,但从句的动词时is 或 are时,可以省去主谓.
比如
只有当你生病的时候,你才会发现馒头和白米粥是最可口的食物.
when ill,you will find mantou and pure rice porridge are only the best food.
还是
when you are ill,you will find mantou and pure rice porridge are only the best food