你刚才在教课吧。

（你口袋上有粉笔灰。）

（三）现在完成时和现在完成进行时的区别

1. 现在完成进行时更强调动作的延续性，它是现在完成时的强调形式。

We've been living here for ten years.

We've lived here for ten years.

我们在这儿已经住了十年了。

2. 在不和时间状语的情况下，现在完成进行时表示动作仍在进行。而现在完成时则表示动作在过去已结束。

The students have been preparing for the exam.

（还在进行）学生们一直在准备考试。

The students have prepared for the exam.

（已经结束）学生们为考试作了准备。

3．有些表示状态、感情、感觉的动词如：have, exist, like, hate, hear, know, sound等动词不能用于现在完成进行时，但可用于现在完成时。

They've known each other since 1970.

自从1970年起他们就相互认识了。

结论: 现在完成进行时主要用于表示

B. 过去开始, 现在刚刚停止的动作;

现在完成时主要用于表示已经完成的动作及其与现在的关系。

我的疑问:

课内探究：(见情景导学语法部分)

课后反思:

课后训练：1.完成下列的练习

1. People (play) music for thousands of years.

2. My friend (try) to get into the team for two years.

3. Tom (do) his homework all this morning.

4.-- Hi, Tracy, you look tired.

-- I'm tired. I （paint）in the living room all day.

5. Although these scientists (work)on the project for nearly four years, I don't know how long it will last.

6. Now that she is out of job, Lucy (consider)going back to school, but she hasn't decided yet.

7. The little boy is dirty from head to foot because he (play)in the mud all morning.

8. I (make)a poetry of sound since I started playing the pipa.

2.下一课时的课前预习练习题

课后学习指导：掌握并能运用现在完成进行时