diff --git a/src/CancelCourseEvent.php b/src/CancelCourseEvent.php
new file mode 100644
index 0000000..fa10eb7
--- /dev/null
+++ b/src/CancelCourseEvent.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace App;
+
+class CancelCourseEvent extends Event
+{
+
+}
\ No newline at end of file
diff --git a/src/Email.php b/src/Email.php
new file mode 100644
index 0000000..9f51c22
--- /dev/null
+++ b/src/Email.php
@@ -0,0 +1,12 @@
+<?php
+
+namespace App;
+
+
+class Email extends Notifychannel
+{
+    public function notify(string $message)
+    {
+        echo '[Email]' . $message . PHP_EOL;
+    }
+}
\ No newline at end of file
diff --git a/src/Event.php b/src/Event.php
new file mode 100644
index 0000000..1b13eda
--- /dev/null
+++ b/src/Event.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace App;
+
+class Event
+{
+    // /**
+    //  * @var NotifyChannel[]
+    //  */
+    private $notifyChannels;
+
+    public function __construct(array $notifyChannels)
+    {
+        $this->notifyChannels = $notifyChannels;
+    }
+
+    public function dispatch(User $user)
+    {
+        foreach ($this->notifyChannels as $notifyChannel) {
+            $message = $user->getLanguage()->getContent(get_called_class());
+            $notifyChannel->notify($message);
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/HelloWorld.php b/src/HelloWorld.php
index 595152d..540fee4 100644
--- a/src/HelloWorld.php
+++ b/src/HelloWorld.php
@@ -6,6 +6,6 @@ class HelloWorld
 {
     public function say()
     {
-        return 'Hello, world';
+        return 'Hello, 123';
     }
 }
\ No newline at end of file
diff --git a/src/Language.php b/src/Language.php
new file mode 100644
index 0000000..4914fe8
--- /dev/null
+++ b/src/Language.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace App;
+
+abstract class Language
+{
+    public abstract function getContent($eventName): string;
+}
\ No newline at end of file
diff --git a/src/LanguageENUS.php b/src/LanguageENUS.php
new file mode 100644
index 0000000..8f5e31d
--- /dev/null
+++ b/src/LanguageENUS.php
@@ -0,0 +1,22 @@
+<?php
+
+namespace App;
+
+use App\Language;
+use App\CancelCourseEvent;
+use App\ReserveClassEvent;
+use App\RegisterSuccessEvent;
+
+class LanguageENUS extends Language
+{
+    public function getContent($eventName): string
+    {
+        $map = [
+            RegisterSuccessEvent::class => 'register success',
+            ReserveClassEvent::class => 'reserve class',
+            CancelCourseEvent::class => 'cancel class',
+        ];
+
+        return $map[$eventName];
+    }
+}
\ No newline at end of file
diff --git a/src/LanguageZHTW.php b/src/LanguageZHTW.php
new file mode 100644
index 0000000..bbc04e8
--- /dev/null
+++ b/src/LanguageZHTW.php
@@ -0,0 +1,23 @@
+<?php
+
+namespace App;
+
+use App\Language;
+use App\CancelCourseEvent;
+use App\ReserveClassEvent;
+use App\RegisterSuccessEvent;
+
+class LanguageZHTW extends Language
+{
+    public function getContent($eventName): string
+    {
+        $map = [
+            RegisterSuccessEvent::class => '註冊成功',
+            ReserveClassEvent::class => '預約課程',
+            CancelCourseEvent::class => '取消課程',
+        ];
+
+        return $map[$eventName];
+    }
+}
+
diff --git a/src/Notifychannel.php b/src/Notifychannel.php
new file mode 100644
index 0000000..b68a7b8
--- /dev/null
+++ b/src/Notifychannel.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace App;
+
+abstract class NotifyChannel
+{
+    public abstract function notify(string $message);
+}
\ No newline at end of file
diff --git a/src/RegisterSuccessEvent.php b/src/RegisterSuccessEvent.php
new file mode 100644
index 0000000..3f0b451
--- /dev/null
+++ b/src/RegisterSuccessEvent.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace App;
+
+class RegisterSuccessEvent extends Event
+{
+
+}
\ No newline at end of file
diff --git a/src/ReserveClassEvent.php b/src/ReserveClassEvent.php
new file mode 100644
index 0000000..759e154
--- /dev/null
+++ b/src/ReserveClassEvent.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace App;
+
+class ReserveClassEvent extends Event
+{
+
+}
\ No newline at end of file
diff --git a/src/Sms.php b/src/Sms.php
new file mode 100644
index 0000000..c48d7b7
--- /dev/null
+++ b/src/Sms.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace App;
+
+class Sms extends NotifyChannel
+{
+    public function notify(string $message)
+    {
+        echo '[SMS]' . $message . PHP_EOL;
+    }
+}
\ No newline at end of file
diff --git a/src/Student.php b/src/Student.php
new file mode 100644
index 0000000..126b37a
--- /dev/null
+++ b/src/Student.php
@@ -0,0 +1,16 @@
+<?php
+
+namespace App;
+
+class Student extends User
+{
+    public function reserve()
+    {
+
+    }
+
+    public function cancel()
+    {
+
+    }
+}
\ No newline at end of file
diff --git a/src/Telegram.php b/src/Telegram.php
new file mode 100644
index 0000000..68c0d85
--- /dev/null
+++ b/src/Telegram.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace App;
+
+class Telegram extends NotifyChannel
+{
+    public function notify(string $message)
+    {
+        echo '[Telegram]' . $message . PHP_EOL;
+    }
+}
\ No newline at end of file
diff --git a/src/User.php b/src/User.php
new file mode 100644
index 0000000..b18c041
--- /dev/null
+++ b/src/User.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace App;
+
+use App\Sms;
+use App\Email;
+use App\Language;
+use App\RegisterSuccessEvent;
+
+class User
+{
+    protected $language;
+
+    public function __construct(Language $language)
+    {
+        $this->language = $language;
+    }
+
+    public function getLanguage()
+    {
+        return $this->language;
+    }
+
+    public function register()
+    {
+        $notifyChannels = [new Email(), new Sms()];
+        $event = new RegisterSuccessEvent($notifyChannels);    
+        $event->dispatch($this);
+    }
+
+    public function cancel()
+    {
+        $notifyChannels = [new Email(), new Telegram()];
+        $event = new CancelCourseEvent($notifyChannels);
+        $event->dispatch($this);
+    }
+    public function reserve()
+    {
+        $notifyChannels = [new Email(), new Telegram()];
+        $event = new ReserveClassEvent($notifyChannels);
+        $event->dispatch($this);
+    }
+}
\ No newline at end of file
diff --git a/src/index.php b/src/index.php
index 0bfaa13..2f2d6b4 100644
--- a/src/index.php
+++ b/src/index.php
@@ -2,6 +2,38 @@
 require_once 'vendor/autoload.php';
 
 use App\HelloWorld;
+use App\LanguageENUS;
+use App\LanguageZHTW;
+use App\User;
 
-$helloWorld = new HelloWorld();
-echo $helloWorld->say();
\ No newline at end of file
+//  $helloWorld = new HelloWorld();
+//  echo $helloWorld->say();
+//  $helloWorld = new HelloWorld();
+//  echo $helloWorld->say();
+
+ 
+$rick = new User(new LanguageENUS());
+$morty = new User(new LanguageZHTW());
+
+// // 註冊成功: email & sms
+// // [email] register success
+// // [sms] register success
+$rick->register();
+
+// // [email] 註冊成功
+// // [sms] 註冊成功
+$morty->register();
+
+
+// 學生預約課程: email & telegram
+// [email] reserve class
+// [telegram] reserve class
+$rick->reserve();
+
+// [email] 學生預約課程
+// [telegram] 學生預約課程
+$morty->reserve();
+
+// 學生取消課程: email & telegram
+$rick->cancel();
+$morty->cancel();
\ No newline at end of file