2. Unit 6 How long have you been collecting shells?

3. How long? Alison I’ve been skating for five hours. Sam I skated for four hours. Victor Celia I’ve been skating for five hours. I skated for two hours. 试比较： I’ve been skating for four hours 与 I skated for four hours. 有何区别？

4. A: Alison, how long have you been skating? B: I’ve been skating for five hours. A: Wow! Sam, how long did you skate? C: I skated for four hours. I started at nine o’clock in the morning and stopped at one o’clock in the afternoon. I’m very tired! A: When did you start skating, Victor? D: At nine o’clock. A: So you’ve been skating for … D: I’ve been skating for five hours. A: How long did you skate, Celia? E: Umm, let’s see… I skated for two hours. Who is still skating now?

5. QuestionsAnswers _ _ 1. How long did you skate today? __ 2. How long have you been skating today? __ 3. Was this your first skating marathon? __ 4. Do you skate every day? __ 5. When did you get your first pair of skates? __ 6. How long have you been skating? a. No, I skated in a marathon last year. b. Yes, I do. c. For six hours. d. Since I was seven years old. √ √ √ √

6. 自我小测验： 1 、自从三岁起她就在练钢琴了。 2 、我游泳已坚持了 10 年了。 3 、 Sam 三年前就开始滑冰了。 4 、他在北京呆了多久了？ 5 、从今天上午九点钟起，我们一直在等候好 消息。 She has been practicing the piano since she was 3 years old. I have been swimming for ten years. Sam has been skating since 3 years ago. How long has he been in Beijing? We have been waiting for the good news since 9 o’clock this morning.

7. Grammar focus 1. How long have you been skating? I’ve been skating for five hours. 2. How long did you skate? I skated for two hours. I’ve been skating since nine o’clock. (I’ve=I have)

8. I have been skating for five hours. 时态－现在完成进行时构成形式： have / has been + Ving have / has 是助动词 been 是 be 的过去分词 后面加动词的现在分词 表示从过去开始一直持续到现在的动作， 现在可能仍在进行着, 并有可能持续下去. 你知道了吗 ?

9. 引导时间的介词 for 与 since 的区别 ( for 与 since 引导的短语用 how long 提问 ) for since 表示时间的持续表示 “ 自从过去某 一时间点以来 ” for + 时间段 since + 时间点 强调一段时间强调动作或状态 一直延续到现在

10. 用 for 和 since 填空 1.They have been learning Chinese ____ they came to China. 2. I haven’t seen her _____ a long time. 3. He has been living here ___ 2001. 4. She has been doing her homework ____two hours. 5. It’s 5 years _____ we left school. 6. – How long has Mary been a teacher? – _____ two years ago. since for since for since Since

11. I’m talking to you from the Hilltop School Skating Marathon. Here, students are skating to raise money for charity. For every hour they skate, each student raises ten yuan for charity. The skating marathon has been going for five hours now, and several skaters are still skating. Alison was the first one to start and has been skating for the whole five hours. Next is Sam, and he has been skating for four hours. Lu Ning has been skating for four hours too, and Li Chen just started an hour ago.

12. Name Has been skating for Alison 5 hours Sam4 hours Lu Ning 4 hours Li Chen 1 hour It’s now 2 pm. Write the students’ names on the time line. 9 am 10 am 11 am 12 am 1 pm 2 pm Li Chen Lu Ning Sam Alison

13. Talk with your friends. Ask them what sports they play and fill in the chart. A: Wu Fan, what sport do you play? B: … A: When did you start? B: When I was … A: So how long have you been playing? B: …