Index: gc_core/py/lang_core/gc_engine.py
==================================================================
--- gc_core/py/lang_core/gc_engine.py
+++ gc_core/py/lang_core/gc_engine.py
@@ -1020,12 +1020,16 @@
     return any(zPattern.search(sMorph)  for sMorph in lMorph)
 
 
 def g_analyse (dToken, sPattern, sNegPattern="", nLeft=None, nRight=None, bMemorizeMorph=True):
     "analyse a token, return True if <sNegPattern> not in morphologies and <sPattern> in morphologies (disambiguation off)"
-    sValue = dToken["sValue"]  if nLeft is not None  else dToken["sValue"][slice(nLeft, nRight)]
-    lMorph = _oSpellChecker.getMorph(sValue)
+    if nLeft is not None:
+        lMorph = _oSpellChecker.getMorph(dToken["sValue"][slice(nLeft, nRight)])
+        if bMemorizeMorph:
+            dToken["lMorph"] = lMorph
+    else:
+        lMorph = _oSpellChecker.getMorph(dToken["sValue"])
     if not lMorph:
         return False
     # check negative condition
     if sNegPattern:
         if sNegPattern == "*":