diff --git a/osc/build.py b/osc/build.py
index 5199ec3b..1834ef01 100644
--- a/osc/build.py
+++ b/osc/build.py
@@ -694,10 +694,10 @@ def main(apiurl, opts, argv):
                 if pkg_meta_e:
                     print('ERROR: Either wrong repo/arch as parameter or a parse error of .spec/.dsc/.kiwi file due to syntax error', file=sys.stderr)
                 else:
-                    print('The package \'%s\' does not exists - please ' \
+                    print('The package \'%s\' does not exist - please ' \
                                         'rerun with \'--local-package\'' % pac, file=sys.stderr)
             else:
-                print('The project \'%s\' does not exists - please ' \
+                print('The project \'%s\' does not exist - please ' \
                                     'rerun with \'--alternative-project <alternative_project>\'' % prj, file=sys.stderr)
             sys.exit(1)
         else:
diff --git a/osc/commandline.py b/osc/commandline.py
index d9023a9e..18f73e93 100644
--- a/osc/commandline.py
+++ b/osc/commandline.py
@@ -8149,7 +8149,7 @@ Please submit there instead, or use --nodevelproject to force direct submission.
         """
 
         if not os.path.isfile(source):
-            raise oscerr.WrongArgs("Source file '%s' does not exists or is no file" % source)
+            raise oscerr.WrongArgs("Source file '%s' does not exist or is not a file" % source)
         if not opts.force and os.path.isfile(dest):
             raise oscerr.WrongArgs("Dest file '%s' already exists" % dest)
         if os.path.isdir(dest):
diff --git a/osc/core.py b/osc/core.py
index 3d6bcc27..0e4dc6f7 100644
--- a/osc/core.py
+++ b/osc/core.py
@@ -2989,14 +2989,14 @@ def slash_split(l):
 def expand_proj_pack(args, idx=0, howmany=0):
     """looks for occurance of '.' at the position idx.
     If howmany is 2, both proj and pack are expanded together
-    using the current directory, or none of them, if not possible.
+    using the current directory, or none of them if not possible.
     If howmany is 0, proj is expanded if possible, then, if there
     is no idx+1 element in args (or args[idx+1] == '.'), pack is also
     expanded, if possible.
     If howmany is 1, only proj is expanded if possible.
 
-    If args[idx] does not exists, an implicit '.' is assumed.
-    if not enough elements up to idx exist, an error is raised.
+    If args[idx] does not exist, an implicit '.' is assumed.
+    If not enough elements up to idx exist, an error is raised.
 
     See also parseargs(args), slash_split(args), findpacs(args)
     All these need unification, somehow.