diff --git a/d2j-jasmin/src/main/java/com/googlecode/d2j/jasmin/Jar2JasminCmd.java b/d2j-jasmin/src/main/java/com/googlecode/d2j/jasmin/Jar2JasminCmd.java
index 492e35a2f..48962c7e5 100644
--- a/d2j-jasmin/src/main/java/com/googlecode/d2j/jasmin/Jar2JasminCmd.java
+++ b/d2j-jasmin/src/main/java/com/googlecode/d2j/jasmin/Jar2JasminCmd.java
@@ -52,7 +52,7 @@ protected void doCommandLine() throws Exception {
 
         Path jar = new File(remainingArgs[0]).toPath().toAbsolutePath();
         if (!Files.exists(jar)) {
-            System.err.println(jar + " is not exists");
+            System.err.println(jar + " doesn't exist");
             usage();
             return;
         }
diff --git a/d2j-jasmin/src/main/java/com/googlecode/d2j/jasmin/Jasmin2JarCmd.java b/d2j-jasmin/src/main/java/com/googlecode/d2j/jasmin/Jasmin2JarCmd.java
index 6bd6c5413..b32db1629 100644
--- a/d2j-jasmin/src/main/java/com/googlecode/d2j/jasmin/Jasmin2JarCmd.java
+++ b/d2j-jasmin/src/main/java/com/googlecode/d2j/jasmin/Jasmin2JarCmd.java
@@ -71,7 +71,7 @@ protected void doCommandLine() throws Exception {
 
         Path jar = new File(remainingArgs[0]).toPath().toAbsolutePath();
         if (!Files.exists(jar)) {
-            System.err.println(jar + " is not exists");
+            System.err.println(jar + " doesn't exist");
             usage();
             return;
         }
diff --git a/d2j-smali/src/main/java/com/googlecode/d2j/smali/BaksmaliCmd.java b/d2j-smali/src/main/java/com/googlecode/d2j/smali/BaksmaliCmd.java
index f1253d702..54ac21156 100644
--- a/d2j-smali/src/main/java/com/googlecode/d2j/smali/BaksmaliCmd.java
+++ b/d2j-smali/src/main/java/com/googlecode/d2j/smali/BaksmaliCmd.java
@@ -36,7 +36,7 @@ protected void doCommandLine() throws Exception {
 
         File dex = new File(remainingArgs[0]);
         if (!dex.exists()) {
-            System.err.println("ERROR: " + dex + " is not exists");
+            System.err.println("ERROR: " + dex + " doesn't exist");
             return;
         }
         if (output == null) {
diff --git a/dex-ir/src/main/java/com/googlecode/dex2jar/ir/TypeClass.java b/dex-ir/src/main/java/com/googlecode/dex2jar/ir/TypeClass.java
index ef94b0664..d4f089be2 100644
--- a/dex-ir/src/main/java/com/googlecode/dex2jar/ir/TypeClass.java
+++ b/dex-ir/src/main/java/com/googlecode/dex2jar/ir/TypeClass.java
@@ -101,7 +101,7 @@ public static TypeClass merge(TypeClass thizCls, TypeClass clz) {
                     if ((thizCls == INT && clz == BOOLEAN) || (thizCls == BOOLEAN || clz == INT)) {
                         return INT;
                     }
-                    throw new RuntimeException("can not merge " + thizCls + " and " + clz);
+                    throw new RuntimeException("Can't merge " + thizCls + " and " + clz);
                 } else {
                     return thizCls;
                 }
@@ -123,7 +123,7 @@ public static TypeClass merge(TypeClass thizCls, TypeClass clz) {
      */
     private static TypeClass merge0(TypeClass a, TypeClass b) {
         if (a == JD || b == JD) {
-            throw new RuntimeException("can not merge " + a + " and " + b);
+            throw new RuntimeException("Can't merge " + a + " and " + b);
         }
         switch (a) {
             case ZIL:
diff --git a/dex-reader/src/main/java/com/googlecode/d2j/reader/DexFileReader.java b/dex-reader/src/main/java/com/googlecode/d2j/reader/DexFileReader.java
index d2c4122d3..b9d3a4a39 100755
--- a/dex-reader/src/main/java/com/googlecode/d2j/reader/DexFileReader.java
+++ b/dex-reader/src/main/java/com/googlecode/d2j/reader/DexFileReader.java
@@ -281,7 +281,7 @@ public DexFileReader(InputStream is) throws IOException {
     }
 
     /**
-     * Reads a string index. String indicies are offset by 1, and a 0 value in the stream (-1 as returned by this
+     * Reads a string index. String indices are offset by 1, and a 0 value in the stream (-1 as returned by this
      * method) means "null"
      * 
      * @return index into file's string ids table, -1 means null
@@ -1095,7 +1095,7 @@ private void read_annotation_set_ref_list(int parameter_annotation_offset, DexMe
                     read_annotation_set_item(param_annotation_offset, dpav);
                 }
             } catch (Exception e) {
-                throw new DexException(e, "while accept parameter annotation in parameter:[%d]", j);
+                throw new DexException(e, "While accepting parameter annotation in parameter: [%d]", j);
             }
         }
     }
diff --git a/dex-reader/src/main/java/com/googlecode/d2j/reader/MultiDexFileReader.java b/dex-reader/src/main/java/com/googlecode/d2j/reader/MultiDexFileReader.java
index d99a14440..4dfea8334 100644
--- a/dex-reader/src/main/java/com/googlecode/d2j/reader/MultiDexFileReader.java
+++ b/dex-reader/src/main/java/com/googlecode/d2j/reader/MultiDexFileReader.java
@@ -55,7 +55,7 @@ public static BaseDexFileReader open(byte[] data) throws IOException {
                 return new MultiDexFileReader(dexFileReaders.values());
             }
         }
-        throw new IOException("the src file not a .dex or zip file");
+        throw new IOException("The source file is not a .dex or .zip file");
     }
 
     void init() {
diff --git a/dex-tools/src/main/java/com/googlecode/dex2jar/tools/ApkSign.java b/dex-tools/src/main/java/com/googlecode/dex2jar/tools/ApkSign.java
index 0ab8b6778..2a3cc5975 100644
--- a/dex-tools/src/main/java/com/googlecode/dex2jar/tools/ApkSign.java
+++ b/dex-tools/src/main/java/com/googlecode/dex2jar/tools/ApkSign.java
@@ -54,7 +54,7 @@ protected void doCommandLine() throws Exception {
 
         Path apkIn = new File(remainingArgs[0]).toPath();
         if (!Files.exists(apkIn)) {
-            System.err.println(apkIn + " is not exists");
+            System.err.println(apkIn + " doesn't exist");
             usage();
             return;
         }
diff --git a/dex-tools/src/main/java/com/googlecode/dex2jar/tools/AsmVerify.java b/dex-tools/src/main/java/com/googlecode/dex2jar/tools/AsmVerify.java
index ffde075ce..0c633846e 100644
--- a/dex-tools/src/main/java/com/googlecode/dex2jar/tools/AsmVerify.java
+++ b/dex-tools/src/main/java/com/googlecode/dex2jar/tools/AsmVerify.java
@@ -118,7 +118,7 @@ protected void doCommandLine() throws Exception {
         for (String fn : remainingArgs) {
             Path file = new File(fn).toPath();
             if (!Files.exists(file)) {
-                System.err.println(fn + " is not exists");
+                System.err.println(fn + " doesn't exist");
                 usage();
                 return;
             }
diff --git a/dex-tools/src/main/java/com/googlecode/dex2jar/tools/DeObfInitCmd.java b/dex-tools/src/main/java/com/googlecode/dex2jar/tools/DeObfInitCmd.java
index a0c17f1fa..dc168ff9a 100644
--- a/dex-tools/src/main/java/com/googlecode/dex2jar/tools/DeObfInitCmd.java
+++ b/dex-tools/src/main/java/com/googlecode/dex2jar/tools/DeObfInitCmd.java
@@ -49,7 +49,7 @@ protected void doCommandLine() throws Exception {
 
         Path jar = new File(remainingArgs[0]).toPath();
         if (!Files.exists(jar)) {
-            System.err.println(jar + " is not exists");
+            System.err.println(jar + " doesn't exist");
             usage();
             return;
         }
diff --git a/dex-tools/src/main/java/com/googlecode/dex2jar/tools/DecryptStringCmd.java b/dex-tools/src/main/java/com/googlecode/dex2jar/tools/DecryptStringCmd.java
index 54e8fdb1f..216f071ab 100644
--- a/dex-tools/src/main/java/com/googlecode/dex2jar/tools/DecryptStringCmd.java
+++ b/dex-tools/src/main/java/com/googlecode/dex2jar/tools/DecryptStringCmd.java
@@ -162,7 +162,7 @@ protected void doCommandLine() throws Exception {
 
         final Path jar = new File(remainingArgs[0]).toPath();
         if (!Files.exists(jar)) {
-            System.err.println(jar + " is not exists");
+            System.err.println(jar + " doesn't exist");
             return;
         }
         if (output == null) {
diff --git a/dex-tools/src/main/java/com/googlecode/dex2jar/tools/DexRecomputeChecksum.java b/dex-tools/src/main/java/com/googlecode/dex2jar/tools/DexRecomputeChecksum.java
index aa8b7005e..5a2c5e716 100644
--- a/dex-tools/src/main/java/com/googlecode/dex2jar/tools/DexRecomputeChecksum.java
+++ b/dex-tools/src/main/java/com/googlecode/dex2jar/tools/DexRecomputeChecksum.java
@@ -44,7 +44,7 @@ protected void doCommandLine() throws Exception {
 
         Path jar = new File(remainingArgs[0]).toPath();
         if (!Files.exists(jar)) {
-            System.err.println(jar + " is not exists");
+            System.err.println(jar + " doesn't exist");
             usage();
             return;
         }
diff --git a/dex-tools/src/main/java/com/googlecode/dex2jar/tools/GenerateCompileStubFromOdex.java b/dex-tools/src/main/java/com/googlecode/dex2jar/tools/GenerateCompileStubFromOdex.java
index 42b12ab81..658b871f8 100644
--- a/dex-tools/src/main/java/com/googlecode/dex2jar/tools/GenerateCompileStubFromOdex.java
+++ b/dex-tools/src/main/java/com/googlecode/dex2jar/tools/GenerateCompileStubFromOdex.java
@@ -14,7 +14,8 @@
 import java.nio.file.Files;
 import java.nio.file.Path;
 
-@BaseCmd.Syntax(cmd = "d2j-generate-stub-from-odex", syntax = "[options] <odex0> [odex1 ... odexN]", desc = "Genenerate no-code jar from odex")
+@BaseCmd.Syntax(cmd = "d2j-generate-stub-from-odex", syntax = "[options] <odex0> [odex1 ... odexN]", desc =
+        "Generate no-code jar from odex")
 public class GenerateCompileStubFromOdex extends BaseCmd {
     private static final int MAGIC_ODEX = 0x0A796564 & 0x00FFFFFF;// hex for 'dey ', ignore the 0A
     private static final int MAGIC_DEX = 0x0A786564 & 0x00FFFFFF;// hex for 'dex ', ignore the 0A
@@ -31,7 +32,7 @@ public static void main(String... args) {
     @Override
     protected void doCommandLine() throws Exception {
         if (remainingArgs.length == 0) {
-            throw new HelpException("no odex");
+            throw new HelpException("No odex");
         }
         if (output == null) {
             output = new File("stub.jar").toPath();
@@ -40,7 +41,7 @@ protected void doCommandLine() throws Exception {
         try (FileSystem fs = createZip(output)) {
             Path out = fs.getPath("/");
             for (String x : remainingArgs) {
-                System.err.println("process " + x + " ...");
+                System.err.println("Processing " + x + " ...");
                 ByteBuffer bs = ByteBuffer.wrap(Files.readAllBytes(new File(x).toPath()))
                         .order(ByteOrder.LITTLE_ENDIAN);
                 int magic = bs.getInt(0) & 0x00FFFFFF;
@@ -53,7 +54,7 @@ protected void doCommandLine() throws Exception {
                 } else if (magic == MAGIC_DEX) {
                     doDex(bs, out);
                 } else {
-                    throw new RuntimeException("file " + x + " is not an dex or odex");
+                    throw new RuntimeException("File " + x + " is not an dex or odex");
                 }
 
             }
@@ -70,7 +71,7 @@ private void doDex(ByteBuffer bs, final Path out) {
             public ClassVisitor create(final String classInternalName) {
                 final Path target = out.resolve(classInternalName + ".class");
                 if (Files.exists(target)) {
-                    System.err.println("class " + classInternalName + " is already exists, skipping.");
+                    System.err.println("Class " + classInternalName + " already exists, skipping.");
                     return null;
                 }
                 return new ClassVisitor(Opcodes.ASM4, new ClassWriter(ClassWriter.COMPUTE_MAXS)) {
diff --git a/dex-tools/src/main/java/com/googlecode/dex2jar/tools/JarAccessCmd.java b/dex-tools/src/main/java/com/googlecode/dex2jar/tools/JarAccessCmd.java
index 6fd883468..0a475a85b 100644
--- a/dex-tools/src/main/java/com/googlecode/dex2jar/tools/JarAccessCmd.java
+++ b/dex-tools/src/main/java/com/googlecode/dex2jar/tools/JarAccessCmd.java
@@ -126,7 +126,7 @@ protected void doCommandLine() throws Exception {
 
         Path jar = new File(remainingArgs[0]).toPath();
         if (!Files.exists(jar)) {
-            System.err.println(jar + " is not exists");
+            System.err.println(jar + " doesn't exist");
             usage();
             return;
         }
diff --git a/dex-translator/src/main/java/com/googlecode/d2j/dex/ExDex2Asm.java b/dex-translator/src/main/java/com/googlecode/d2j/dex/ExDex2Asm.java
index de30fc814..86eee1222 100644
--- a/dex-translator/src/main/java/com/googlecode/d2j/dex/ExDex2Asm.java
+++ b/dex-translator/src/main/java/com/googlecode/d2j/dex/ExDex2Asm.java
@@ -40,7 +40,7 @@ public void convertCode(DexMethodNode methodNode, MethodVisitor mv, ClzCtx clzCt
             super.convertCode(methodNode, mn, clzCtx);
         } catch (Exception ex) {
             if (exceptionHandler == null) {
-                throw new DexException(ex, "fail convert code for %s", methodNode.method);
+                throw new DexException(ex, "Failed to convert code for %s", methodNode.method);
             } else {
                 mn.instructions.clear();
                 mn.tryCatchBlocks.clear();
diff --git a/dex-translator/src/test/java/com/googlecode/dex2jar/test/TestUtils.java b/dex-translator/src/test/java/com/googlecode/dex2jar/test/TestUtils.java
index f75531a8a..7a8d85e3d 100644
--- a/dex-translator/src/test/java/com/googlecode/dex2jar/test/TestUtils.java
+++ b/dex-translator/src/test/java/com/googlecode/dex2jar/test/TestUtils.java
@@ -308,7 +308,7 @@ public void convertCode(DexMethodNode methodNode, MethodVisitor mv, ClzCtx clzCt
                     } catch (IOException e) {
                         e.printStackTrace();
                     }
-                    throw new DexException(ex, "fail convert code %s", methodNode.method);
+                    throw new DexException(ex, "Failed to convert code for %s", methodNode.method);
                 }
             }
         };