Each, Each of

Each
Each is a determiner and used before a singular noun.
For example
Each class is important.
Each apartment has living room.
Each student got book.
Each person has different problems.

Each of 
Each can also be used with plural nouns and pronoun,but must be followed by of. OR you also use each of in front of plural noun or pronoun.

Each of the students is responsible.
Each of the blogs has their own significant.
Each of the dresses has been ironed.
Each of them is ready for presentation.
Each of us was in the meeting.

Each with verb
-refers as a subject.
-each goes before verb
- each goes in between to be  (auxiliary verb )verb

The three students each got one laptop
The five teachers each gets twenty-five minutes.
The level one students have each been presented.


Each in negative clause 
Not this: Each participate do not agree to build  building.
But this: None of the participate agree to build building.

Not this:  Each of the boys did not enjoy basketball.
But this: None of the boys enjoy basketball.
But this: None of them are foreigner.
But this: None of these application is useful.
Don't say almost each, nearly each , but you can say almost every, nearly every.