diff --git a/demo/plugins/groupadmin.py b/demo/plugins/groupadmin.py
index cfd42f11..b596f0a2 100644
--- a/demo/plugins/groupadmin.py
+++ b/demo/plugins/groupadmin.py
@@ -1,6 +1,7 @@
 from aiocqhttp import Error as CQHttpError
 
 from none import on_notice, NoticeSession, on_request, RequestSession
+from none.helpers import render_expression as __
 
 GROUP_GREETING = (
     '欢迎新同学 {name}[]！[CQ:face,id=63][CQ:face,id=63][CQ:face,id=63]',
@@ -18,7 +19,7 @@ async def _(session: NoticeSession):
         info = await session.bot.get_group_member_info(**session.ctx,
                                                        no_cache=True)
         name = info['card'] or info['nickname'] or '新成员'
-        await session.send_expr(GROUP_GREETING, name=name, **session.ctx)
+        await session.send(__(GROUP_GREETING, name=name, **session.ctx))
     except CQHttpError:
         pass
 
diff --git a/demo/plugins/tuling.py b/demo/plugins/tuling.py
index bc6fc8d0..3fe3cc56 100644
--- a/demo/plugins/tuling.py
+++ b/demo/plugins/tuling.py
@@ -1,5 +1,3 @@
-import asyncio
-
 from none import (
     on_command, CommandSession,
     on_natural_language, NLPSession, NLPResult
@@ -12,7 +10,7 @@ async def tuling(session: CommandSession):
 
     finish = message in ('结束', '拜拜', '再见')
     if finish:
-        asyncio.ensure_future(session.send('拜拜啦，你忙吧，下次想聊天随时找我哦~'))
+        session.finish('拜拜啦，你忙吧，下次想聊天随时找我哦~')
         return
 
     # call tuling api
@@ -20,10 +18,9 @@ async def tuling(session: CommandSession):
 
     one_time = session.get_optional('one_time', False)
     if one_time:
-        asyncio.ensure_future(session.send(reply))
+        session.finish(reply)
     else:
-        del session.args['message']
-        session.get('message', prompt=reply)
+        session.pause(reply)
 
 
 @tuling.args_parser
diff --git a/demo/plugins/weather/__init__.py b/demo/plugins/weather/__init__.py
index 4696ff10..01392289 100644
--- a/demo/plugins/weather/__init__.py
+++ b/demo/plugins/weather/__init__.py
@@ -2,16 +2,17 @@ from none import (
     CommandSession, CommandGroup,
     on_natural_language, NLPSession, NLPResult
 )
+from none.helpers import render_expression as __
 
-from . import expressions as expr
+from . import expressions as e
 
 w = CommandGroup('weather')
 
 
 @w.command('weather', aliases=('天气', '天气预报'))
 async def weather(session: CommandSession):
-    city = session.get('city', prompt_expr=expr.WHICH_CITY)
-    await session.send_expr(expr.REPORT, city=city)
+    city = session.get('city', prompt=__(e.WHICH_CITY))
+    await session.send(__(e.REPORT, city=city))
 
 
 @weather.args_parser