02 expression in class

Expression In Class课堂用语 
16. May I come in?我能进来吗？ 
17. Come in, please.请进。 
18. Sit down, please.请坐。 
19. It's time for class.上课时间到了。 
20. Open your books and turn to page 20.打开书，翻到第20页。 
21. I'll call the roll before class.课前我要点名。 
22. Here!到！ 
23. Has everybody got a sheet?每个人都拿到材料了吗？ 
24. Any different opinion?有不同意见吗？ 
25. Are you with me?你们跟上我讲的了吗？ 
26. Have I made myself clear?我讲明白了吗？ 
27. Could you say it again?你能再说一遍吗？ 
28. Any questions?有什么问题吗？ 
29. That's all for today.今天就讲到这里。 
30. Please turn in your paper before leaving.请在离开前将论文交上。