It's important to use Ę, because it might change the meaning of the sentence: pracujĘ(I work) and pracujE(he/she/it works).
because it is a different structure. What you are thinking about is "Jestem lekarzem"= I am a doctor, you ussually need instrumental case after "jestem". Here you have Pracuję jako- and you use nominative "lekarz".
Thanks, in the sentence: "ona pracuje jako modelka " is "modelKA" a nominative femenine?
yes. "modelka" is feminine nominative. (and feminine -a ending nouns, end with -a only in singular nominative)
Anyone else get mixed up with 'lekarz' and 'talerz'? Thought this said 'i work as a plate'
Does this sound weird if a woman would say this? Or is "Pracuję jako lekarka" more correct?