WF word form WC 就是下面才VC vocabulary choice 词语选择 WO word order WF word form VC vocabulary choice VF verb form S/V subject / verb agreement T tense CL clause construction PR preposition AR article U noun is uncountable C noun is countable S/PL singular or plural change needed AV use active voice PV use passive voice - missing word or words R redundant word(s) IR irrelevant information LNF language too informal P punctuation PARA paragraph problem SP spelling mistake
