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Comma use with non-essential clauses, phrases and words

Clauses that are not sentences.

Clauses that provide extra information.

The sentence makes sense with out the non-essential clause.

Comma usage with non-essential clauses:

Commas are placed before the non-essential clause, and at the end of the non-essential clause.

Examples:

My English teacher, is really nice, is going to give me a letter for college.
The boy, that was playing in the street, that got hit by a car was my brother.
My neighbor, that lives on the 2nd floor, is going to take me to school tomorrow.