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Each is a Singular Subject

One of the most common grammatical errors I see in the writing of students of all levels is the lack of agreement of adjectives and verbs when "each" is the subject of the sentence.
 
For example:
"Each of the cats are calico."
 
This sentence is incorrect because the subject is "each," not "the cats."
 
Therefore, the correct form of the sentence is:
"Each of the cats is calico."
 
If you get confused, remove the words that modify "each" and read the sentence.  In this case, the sentence would read: 
 
"Each is calico."