Each of them has a different job.
Most jobs are challenging in some way.
DETERMINER + OF + DETERMINER + NOUN/OBJECT PRONOUN
None of the employees is/are unhappy.
A lot of people/us work weekends.
All (of) the people at work want to do well.
Each of my children is different.
NONE OF + DETERMINER + NOUN
Neither of them wants/want to retire.
None of them is/are unhappy.
Every one of them is happy.
Every job is different.
All of us work hard.
Both (of) my parents have interesting careers.
NO + NOUN
A few jobs seem easy.
NONE OF + OBJECT PRONOUN
No employees are unhappy.
ALL/EACH/EVERY/BOTH/NEITHER/SOME/A FEW/SEVERAL/MANY/MOST + NOUN