my professor correct my ESL composition, and write abrreviation word: wc, wf what do they stand for?

[Di?n Nh? ??t ?a]

I know some, like this: vf=verb form, vt=verb transitive, but I cannot ask. Please tell me the meaning of WF, WC?

 

[Gretchen S]

Those probably stand for "word form" and "word choice." WF indicates you used, for example, an adjective when you needed an adverb, or some other form of a related word. WC indicates the word you used does not fit or make sense in its sentence.