Subjects
Grades
Commas are used:
to separate clauses and phrases
to separate elements in a list
to address by name
for tag questions
for an interjection.
The first word following a comma is not capitalized.
To separate clauses or elements in a list

To address by name, for tag questions and interjections

Comma placement can affect the meaning of a sentence.
With a comma: address by name

Without a comma: name becomes verb object
