Paragraph  Pronoun Case  Thesis Statementm  Word Form
Paragraph: prg or ¶
If this symbol occurs in the middle of a paragraph, it means that you should have started a new paragraph at that point.
Pronoun Case: case
This comment indicates that you are using a wrong pronoun case.  When you are supposed to use a subjective case of pronoun, by mistake, you use an objective case instead, and vice versa.
Refer to following links for further explanation:
Thesis Statement: TS
Check the points that follow to see what your problem is:
There is no thesis at all. 
The thesis is too general, or a truism.
The thesis is too narrow.
Word Form: f
    Some people may use "part of speech"  instead of  "word form".  When the f symbol dances on your page, you have to tutor yourself on part of speech of words.  That is, you have to be able to tell if a word is in nature a noun, a verb, an adjective, or an adverb.  Often times, a good dictionary can help.
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