@G_mut, please allow me to explain the difference between نمیباشد and نیست. I won't use the sentences that you have provided as I feel there is a problem with them with the inclusion of هیچ وقت being included in both.
Generally speaking, most people would say that نمیباشد and نیست are equivalent and both mean " is not". But in the right context, there is a subtle difference.
نمیباشد would mean "is not" as a matter of habit, as a rule۔
کسان گویند هر جوینده ا ی یابنده میباشد
تو را میجویم و هرگز نمییابم چه حال است این؟
هلالی جغتایی
People say, "Every seeker is (always) a finder"
I seek you but never find (you)! what is this?
مرا شکیب نمیباشد ای مسلمانان
ز روی خوب، لکم دینُکم ولی دینی
سعدی
I dont have the patience O Muslims to avoid a pretty face
At your disposal is your belief and to me belongs my faith
I habitually don't have the patience.....
If you knew Urdu, I would be able to explain to you the difference quite easily!
There is an article on the net entitled میباشد غلط نمیباشد
«میباشد» غلط «نمیباشد»!