老师：Hello everyone, welcome to my class. I'm Liu.
学生：Haiyang from Beijing Guangchun.
老师：Middle School. This is the second period of Unit 4 journey across a vast land. Today we are going to discover a useful structure. In this class, you will summarize and compare the function and meaning of past participles and the present participles, and use past participles and the present participles to describe a travel experience. Now let's begin our class. First, let's look at the sentences from the text, translate them into Chinese, and pay attention to the function of Ed and ing forms.
学生：通过这四个句子我们可以发现，前两个句子中的黑体词使用的是过去分词形式，而后两个句子中使用的则是现在分词形式。下面我们来分组来分析一下。
老师：lets start with sentences with the past parties。 Post.
学生：Do you know the meaning of the.
老师：Sentences? Let's look at them one by one. The first sentence the next day was clear and mild. They were pleased to see the beautiful mountains looking out over the city. How to translate? the sentence yeah the meaning is。
学生：第二天天气晴朗，温度适宜。他们看到壮美的群山，俯瞰着整座城市，甚是欣喜。
老师：the second sentence seeing from the train window， the mountains and the foreigns of Canada looked massive the meaning is。
学生：从车窗往外望去，加拿大巍峨的山脉和辽阔的森林尽收眼底。
老师：so from these two sentences lets look at the position of the past participants。
学生：第一句话中 pleased 跟在 be 动词 war 之后，所以在句子中作表语，而第二句话中。
老师：seeing from the train window。
学生：则作状语，表示从车窗往外望去。
老师：Now let's look at the second group of sentences with present participants. The first one, for both of them, the thought of crossing the whole country by Rio was. exciting the meaning is。
学生：一想到可以坐火车横穿整个国家，姐妹俩就激动不已。 The second.
老师：Looking at the beautiful scenery, they both agreed that it was the most awesome journey they had ever taken. The meaning is.
学生：Wang Zhuyang. 前的风景姐妹俩一致认为这是他们所经历过的最棒的一次旅行。同样和上一组一样，我们来分析一下这两个词在句子中所做的成分。
老师：the first one exciting。
学生：它在句子中跟在 be 动词 was 之后做表语。
老师：而 looking at the beautiful scenery。
学生：意思是望着眼前的风景则作状语。所以通过这两组句子的对比，我们可以发现，过去分词和现在分词在句子中均可作表语和状语。那么当他们在句子中充当同一种成分时又有什么区别？我们一起来分析一下。首先，我们来看一下它们都做表语的这两个句子。第一个句子中， pleased 修饰的是day，意思是感到欣喜的。而 exciting 修饰的是 the thought，意思是令人兴奋的，所以当过去分词和现在分词作状语时，过去分词描述的是情感，意思是感到怎么的。而现在分词描述的是事物，意思是令人怎么怎么的。下面我们再来看一下他们作状语的这两个句子。首先，第一个句子的主语是the。
老师：mountains and forests。
学生：主语和动词 sea 之间的关系是被动的，意思是被从火车车窗放到。而第二个句子的主语是they，它和动词 look 之间的关系是主动的，意思是望着美景。所以因为第一个句子中主语与动词之间的关系是被动的，所以用的是过去分词theme。而第二个句子中主语和动词之间的关系是主动的，所以用的是现在分词looking。
老师：okay，now， lets summarize。
学生：通过这一部分的学习，我们可以了解到，过去分词和现在分词均可以在句子中作表语和作状语。那么当他们做表语时，过去分词常用来描述情感，意思是感到什么什么的。而现在分词则用来描述人物或者地点，意思是令人什么什么的。当他们做状语时，过去分词与逻辑主语之间的关系是被动的，而现在分词与逻辑主语之间的关系则是主动的。
老师：Now is practice time. Please turn to page 41 and look at activity one. Viewing each blank with a correct form of a verb from the box, find the difference between each pair of sentences. Paying attention to t
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