Que vs Qui

Question

I thought I understood when to use que vs qui until I encountered this question in B2:La femme________ je travaille est très sympa. (The woman for whom I work is very nice.)'pour qui' or 'pour que'
It seemed to me the subj.present verb 'travaille' had the ''subject je so the qui/que was providing the object, hence I chose que, but apparently the answer is qui. See also tips in the above lesson, since it is followed by je shouldn't it be que?

Sean Burke · Answer

"Qui" can work as an object when it is preceded by a preposition like "pour" or "à". In English, it would mean "whom" although everyone says "who" which has become accepted. Example: "C'est la femme à qui je parlais." "That's the woman to whom I was speaking."

chris wallis · Answer

I have found that if you can use 'that' in the sentence you need que, and if you can't use 'qui'