diff --git a/unittest/error-bondethernet1.yaml b/unittest/error-bondethernet1.yaml
index 6701db6..63bdc44 100644
--- a/unittest/error-bondethernet1.yaml
+++ b/unittest/error-bondethernet1.yaml
@@ -2,7 +2,7 @@ test:
   description: "Members of a BondEthernet must exist"
   errors:
     expected:
-     - "bondethernet .* member .* doesn't exist"
+     - "bondethernet .* member .* does not exist"
     count: 2
 ---
 bondethernets:
diff --git a/unittest/error-bridgedomain1.yaml b/unittest/error-bridgedomain1.yaml
index 4f65a89..9d3ef74 100644
--- a/unittest/error-bridgedomain1.yaml
+++ b/unittest/error-bridgedomain1.yaml
@@ -2,7 +2,7 @@ test:
   description: "Interfaces put into the bridge, must exist as phy or sub-interface"
   errors:
     expected:
-     - "bridgedomain .* member .* doesn't exist"
+     - "bridgedomain .* member .* does not exist"
     count: 2
 ---
 interfaces:
diff --git a/validator/bondethernet.py b/validator/bondethernet.py
index 1c5d521..7588a3a 100644
--- a/validator/bondethernet.py
+++ b/validator/bondethernet.py
@@ -42,7 +42,7 @@ def validate_bondethernets(yaml):
         logger.debug("bondethernet %s: %s" % (ifname, iface))
         for member in iface['interfaces']:
             if not interface.get_by_name(yaml, member):
-                msgs.append("bondethernet %s member %s doesn't exist" % (ifname, member))
+                msgs.append("bondethernet %s member %s does not exist" % (ifname, member))
                 result = False
 
             if interface.has_sub(yaml, member):
diff --git a/validator/bridgedomain.py b/validator/bridgedomain.py
index ac606b6..4436836 100644
--- a/validator/bridgedomain.py
+++ b/validator/bridgedomain.py
@@ -62,7 +62,7 @@ def validate_bridgedomains(yaml):
             for member in iface['interfaces']:
                 member_iface = interface.get_by_name(yaml, member)
                 if not member_iface:
-                    msgs.append("bridgedomain %s member %s doesn't exist" % (ifname, member))
+                    msgs.append("bridgedomain %s member %s does not exist" % (ifname, member))
                     result = False
                     continue
 
diff --git a/validator/interface.py b/validator/interface.py
index eaacbc2..976fe2b 100644
--- a/validator/interface.py
+++ b/validator/interface.py
@@ -418,7 +418,7 @@ def validate_interfaces(yaml):
 
                 sub_lcp = get_lcp(yaml, sub_ifname)
                 if sub_lcp and len(sub_lcp)>15:
-                    msgs.append("sub-interface %s has LCP with too long name '%s'" % (sub_ifname, sub_lcp))
+                    msgs.append("sub-interface %s has LCP with too long name %s" % (sub_ifname, sub_lcp))
                     result = False
                 if iface_lcp and not lcp.is_unique(yaml, iface_lcp):
                     msgs.append("sub-interface %s does not have a unique LCP name %s" % (sub_ifname, sub_lcp))
@@ -444,7 +444,7 @@ def validate_interfaces(yaml):
                     msgs.append("sub-interface %s has invalid encapsulation" % (sub_ifname))
                     result = False
                 elif not unique_encapsulation(yaml, sub_ifname):
-                    msgs.append("sub-interface %s doesn't have unique encapsulation" % (sub_ifname))
+                    msgs.append("sub-interface %s does not have unique encapsulation" % (sub_ifname))
                     result = False
                 if 'l2xc' in sub_iface:
                     if has_lcp(yaml, sub_ifname):