Check Mark	Your work is correct
?	I cannot read what you have written (usually circled or underlined)
Awk	Awkward - Something is wrong with your sentence structure
DNF	Does Not Follow - your conclusions are not justified
frag	The sentence is a fragment, (i.e., it is missing a subject or verb)
huh	I can read it, but it does not make sense
HDYK	How do you know – The question asked for observations and you are making an assumption
IC	Incomplete. You did not completely answer the question
NG	Not Graded. Usually used with lab reports, this section was not graded.
SF	Significant figures are incorrect
SP	Spelling (word is misspelled)
SW	Show work for credit
u	Units missing or incorrect
X	incorrect (but this doesn't mean you don't have worth as a person)