diff --git a/hgext/convert/bzr.py b/hgext/convert/bzr.py
--- a/hgext/convert/bzr.py
+++ b/hgext/convert/bzr.py
@@ -137,7 +137,7 @@ class bzr_source(converter_source):
 
     def getchanges(self, version, full):
         if full:
-            raise error.Abort(_("convert from cvs do not support --full"))
+            raise error.Abort(_("convert from cvs does not support --full"))
         self._modecache = {}
         self._revtree = self.sourcerepo.revision_tree(version)
         # get the parentids from the cache
diff --git a/hgext/convert/cvs.py b/hgext/convert/cvs.py
--- a/hgext/convert/cvs.py
+++ b/hgext/convert/cvs.py
@@ -263,7 +263,7 @@ class convert_cvs(converter_source):
 
     def getchanges(self, rev, full):
         if full:
-            raise error.Abort(_("convert from cvs do not support --full"))
+            raise error.Abort(_("convert from cvs does not support --full"))
         self._parse()
         return sorted(self.files[rev].iteritems()), {}, set()
 
diff --git a/hgext/convert/darcs.py b/hgext/convert/darcs.py
--- a/hgext/convert/darcs.py
+++ b/hgext/convert/darcs.py
@@ -158,7 +158,7 @@ class darcs_source(converter_source, com
 
     def getchanges(self, rev, full):
         if full:
-            raise error.Abort(_("convert from darcs do not support --full"))
+            raise error.Abort(_("convert from darcs does not support --full"))
         copies = {}
         changes = []
         man = None
diff --git a/hgext/convert/git.py b/hgext/convert/git.py
--- a/hgext/convert/git.py
+++ b/hgext/convert/git.py
@@ -210,7 +210,7 @@ class convert_git(converter_source):
 
     def getchanges(self, version, full):
         if full:
-            raise error.Abort(_("convert from git do not support --full"))
+            raise error.Abort(_("convert from git does not support --full"))
         self.modecache = {}
         fh = self.gitopen("git diff-tree -z --root -m -r %s %s" % (
             self.simopt, version))
diff --git a/hgext/convert/gnuarch.py b/hgext/convert/gnuarch.py
--- a/hgext/convert/gnuarch.py
+++ b/hgext/convert/gnuarch.py
@@ -144,7 +144,7 @@ class gnuarch_source(converter_source, c
 
     def getchanges(self, rev, full):
         if full:
-            raise error.Abort(_("convert from arch do not support --full"))
+            raise error.Abort(_("convert from arch does not support --full"))
         self._update(rev)
         changes = []
         copies = {}
diff --git a/hgext/convert/monotone.py b/hgext/convert/monotone.py
--- a/hgext/convert/monotone.py
+++ b/hgext/convert/monotone.py
@@ -229,7 +229,8 @@ class monotone_source(converter_source, 
 
     def getchanges(self, rev, full):
         if full:
-            raise error.Abort(_("convert from monotone do not support --full"))
+            raise error.Abort(_("convert from monotone does not support "
+                              "--full"))
         revision = self.mtnrun("get_revision", rev).split("\n\n")
         files = {}
         ignoremove = {}
diff --git a/hgext/convert/p4.py b/hgext/convert/p4.py
--- a/hgext/convert/p4.py
+++ b/hgext/convert/p4.py
@@ -277,7 +277,7 @@ class p4_source(converter_source):
 
     def getchanges(self, rev, full):
         if full:
-            raise error.Abort(_("convert from p4 do not support --full"))
+            raise error.Abort(_("convert from p4 does not support --full"))
         return self.files[rev], self.copies[rev], set()
 
     def getcommit(self, rev):
diff --git a/mercurial/exchange.py b/mercurial/exchange.py
--- a/mercurial/exchange.py
+++ b/mercurial/exchange.py
@@ -178,7 +178,7 @@ def buildobsmarkerspart(bundler, markers
         remoteversions = bundle2.obsmarkersversion(bundler.capabilities)
         version = obsolete.commonversion(remoteversions)
         if version is None:
-            raise ValueError('bundler do not support common obsmarker format')
+            raise ValueError('bundler does not support common obsmarker format')
         stream = obsolete.encodemarkers(markers, True, version=version)
         return bundler.newpart('obsmarkers', data=stream)
     return None