1. Good night, Jane. 晚安，简。
2. Good-bye, Mike. 再见，迈克。
3. See you tomorrow. 明天见。
4. See you later. 待会儿见。
5. I have to go now. 我必须走了。
6. May I come in? 我能进来吗?
7. Come in, please. 请进。
8. Sit down, please. 请坐。
9. It's time for class. 上课时间到了。
10. Open your books and turn to page.打开书，翻到第20页。
11. I'll call the roll before class. 课前我要点名。
