diff --git a/waflib/Runner.py b/waflib/Runner.py
index 96ad6e05..bb4c2483 100644
--- a/waflib/Runner.py
+++ b/waflib/Runner.py
@@ -433,7 +433,7 @@ class Parallel(object):
 				self.skip(tsk)
 				self.add_more_tasks(tsk)
 			elif st == Task.CANCEL_ME:
-				# A dependency problem has occured, and the
+				# A dependency problem has occurred, and the
 				# build is most likely run with `waf -k`
 				if Logs.verbose > 1:
 					self.error.append(tsk)
diff --git a/waflib/extras/buildcopy.py b/waflib/extras/buildcopy.py
index 5f77bc59..e742e540 100644
--- a/waflib/extras/buildcopy.py
+++ b/waflib/extras/buildcopy.py
@@ -66,7 +66,7 @@ class buildcopy(Task.Task):
 	"""
 	Copy for each pair `n` in `node_pairs`: n[0] -> n[1].
 
-	Attribute `node_pairs` should contain a list of tuples describing source an target:
+	Attribute `node_pairs` should contain a list of tuples describing source and target:
 
 		node_pairs = [(in, out), ...]
 
diff --git a/waflib/extras/javatest.py b/waflib/extras/javatest.py
old mode 100644
new mode 100755
index 3b5be80e..979b8d82
--- a/waflib/extras/javatest.py
+++ b/waflib/extras/javatest.py
@@ -8,7 +8,7 @@ task via the **javatest** feature.
 
 This gives the possibility to run unit test and have them integrated into the
 standard waf unit test environment. It has been tested with TestNG and JUnit
-but should be easily expandable to other framework given the flexibility of
+but should be easily expandable to other frameworks given the flexibility of
 ut_str provided by the standard waf unit test environment.
 
 Example usage: