VBP (verb, non-3rd person singular present), VBZ (verb, 3rd person singular present) and VBG (verb, gerund or present participle) are the PTB tags that have error rates in 10 highest error rates list for each parser (Malt, MST and the <cite>Bohnet and Nivre (2012)</cite> parser) with each dependency format (SB, CD and DT) and with each PoS tag set (PTB PoS and supertags) when PTB tags are included as CPOSTAG feature.