awk -- awkward phrasing (you need to rephrase so the sentence sounds more fluent)
c.s. -- comma splice (you used a comma where you needed a period or semi-colon. See handbook 480-483)
clarify -- clarify grammar/sentence stucture
conj -- conjunction (do not start a sentence with a conjunction)
contr -- contraction (ex. isn’t, doesn’t, can’t. Do not use contractions in formal writing. If you use a contraction in informal writing, remember the apostrophe.)
dangl. mod. -- dangling modifier (see handbook 435-439)
expl -- explain more clearly
faulty parallelism -- see handbook 432-435
fragment -- sentence fragment (incomplete sentence. See handbook 474-480)
mispl. mod. -- misplaced modifier (see handbook 435-439)
mixed constr -- mixed construction (see handbook 425-427)
p.o.v. shift -- shift in point of view (see handbook 428)
pr.agr. -- pronoun agreement (see handbook 504-508)
pv -- passive voice (see handbook 446-448)
rep -- repetition
run-on -- run-on sentence (see handbook 480-485)
sp -- spelling
sv -- subject-verb agreement (see handbook 486-493)
tense shift -- shift in tense (ex. from present tense to past tense. See handbook 498-500)
undln -- underline
vb -- verb problem (see handbook 493-503)
vocab -- weak or inaccurate vocabulary