diff --git a/data/MultiheadSetupDialog.ui b/data/MultiheadSetupDialog.ui
index 110ad5a..9d2969c 100644
--- a/data/MultiheadSetupDialog.ui
+++ b/data/MultiheadSetupDialog.ui
@@ -532,7 +532,7 @@
             <property name="can_focus">False</property>
             <property name="margin_left">8</property>
             <property name="xalign">0</property>
-            <property name="label" translatable="yes" context="option|multihead">&lt;i&gt;Note: greeter do not set monitors geometry.
+            <property name="label" translatable="yes" context="option|multihead">&lt;i&gt;Note: greeter does not set monitors geometry.
 You need to configure it by yourself.&lt;/i&gt;</property>
             <property name="use_markup">True</property>
             <property name="wrap">True</property>
diff --git a/lightdm_gtk_greeter_settings/helpers.py b/lightdm_gtk_greeter_settings/helpers.py
index 1a6621f..4aacee4 100644
--- a/lightdm_gtk_greeter_settings/helpers.py
+++ b/lightdm_gtk_greeter_settings/helpers.py
@@ -202,12 +202,12 @@
             return _('Directory is not readable: {path}'.format(path=p))
         if st.st_uid == uid:
             return not (st.st_mode & stat.S_IRUSR) and \
-                _('LightDM do not have permissions to read path: {path}'.format(path=p))
+                _('LightDM does not have permissions to read path: {path}'.format(path=p))
         if st.st_gid in gids:
             return not (st.st_mode & stat.S_IRGRP) and \
-                _('LightDM do not have permissions to read path: {path}'.format(path=p))
+                _('LightDM does not have permissions to read path: {path}'.format(path=p))
         return not (st.st_mode & stat.S_IROTH) and \
-            _('LightDM do not have permissions to read path: {path}'.format(path=p))
+            _('LightDM does not have permissions to read path: {path}'.format(path=p))
 
     errors = (check(p) for p in accumulate(parts, os.path.join))
     error = next((error for error in errors if error), None)
@@ -219,14 +219,14 @@
         st = os.stat(path)
         if st.st_uid == uid:
             if not st.st_mode & stat.S_IXUSR:
-                return _('LightDM do not have permissions to execute file: {path}'
+                return _('LightDM does not have permissions to execute file: {path}'
                          .format(path=path))
         elif st.st_gid in gids:
             if not st.st_mode & stat.S_IXGRP:
-                return _('LightDM do not have permissions to execute file: {path}'
+                return _('LightDM does not have permissions to execute file: {path}'
                          .format(path=path))
         elif not st.st_mode & stat.S_IXOTH:
-            return _('LightDM do not have permissions to execute file: {path}'.format(path=path))
+            return _('LightDM does not have permissions to execute file: {path}'.format(path=path))
 
     return error