diff --git a/lib/src/translator/Translate.gf b/lib/src/translator/Translate.gf
index 007dc3211..94b3dc25d 100644
--- a/lib/src/translator/Translate.gf
+++ b/lib/src/translator/Translate.gf
@@ -8,7 +8,7 @@ abstract Translate =
   Conjunction,
   Verb - [
      PassV2,                -- generalized to VPSlash and agents
---     SlashV2V, ComplVV,   -- generalized. But (1) more expensive (2) not available for all languages
+--     SlashV2V, ComplVV,   -- generalized in Extensions, used in Penn. But (1) more expensive (2) not available for all languages
      UseCopula              ---- overgenerating, unnecessary
      ],
   Adverb,
@@ -24,6 +24,15 @@ abstract Translate =
 
   Construction,
   Extensions [
+
+{-
+-- used in Penn treebank
+    CompQS,CompS,CompVP,ComplVPIVV,GenNP,GenRP,GenIP,PastPartRS,PositAdVAdj,
+    PredFrontVS,PredFrontVQ,PresPartRS,SlashSlashV2V,GerundCN,
+    SlashV2V,ComplVV,
+    SlashVPIV2V,UseQuantPN,VPSlashVS,
+-}
+
     ListVPS,BaseVPS,ConsVPS,ConjVPS,ListVPI,BaseVPI,ConsVPI,ConjVPI,
     CompoundN,AdAdV,UttAdV,ApposNP,MkVPI, MkVPS, PredVPS, PassVPSlash, PassAgentVPSlash, CompoundAP,
     DirectComplVS, DirectComplVQ, FocusObjS