Why isnt it peores?
Because it is used in this sentence as an adverb rather than an adjective, and adverbs never change number or gender.
I was marked incorrect for "sentimos peor ahora" - why would the "Nos" be necessary here?
Because it is a reflexive verb (Sentirse), like the verbs Ducharse, Levantarse, etc.
Why not peores?
Here 'peor' is an adverb. it qualifies the verb 'sentimos.' While adjectives change for number and gender, adverbs never do. When used as an adverb, it'll always be 'peor.'
I believe that "nos" is needed here because in this context we need a reflexive verb: sentirse.
We feel worse = nos sentimos peor
Thanks, that helps.
What is wrong with nosotros sentimos peor ahora ?
A reflexive very is required. Otherwise it would imply that your ability to feel is impaired. Nos sentimos peor - we feel worse (as in ill); sentimos peor - we feel worse (like we had a stroke and can't feel).
When it's: we feel happy
It says : nos sentimos felices.
But when it's: we feel worse
Why it's : nos sentimos peor instead of peores?
Toda via no
I do not think "Nos" is necessary. It must be a mistake done by the application.