1、Unit 5 The power of natureGrammarthe ing Form教案Review the usage of ving form:1. Write the following pairs of sentences(or other similar ones)on the board.I was feeling tired. I went to bed earlyFeeling tired I went to bed earlyI worked hard all day. I went to bed earlyHaving worked hard all day, I w
2、ent to bed early.1. Ask student to consider when the action in each pair of sentences happened and Lead them to understand that in the first pair of sentences, the feeling and the action are happening at the same time; whereas in the second pair, the working allday happened before he/she was tired.3
3、. Examine the sentences below and discuss in what way the structures similar to each other and in what way they are differentLooking carefully at the ground, I made my way to the edge of the crater.Having experienced quite a few earthquakes in Hawaii already, I didnt take much notice.Having + past p
4、articiple (the perfect ving form) to refer to an action that took place before the time expressed by main verb.4. Read and discuss Exercise 1 in the SB5. Set Exercise 2. check answers and discuss structures.6. Set Exercise 3, 4 and 5. check answers after each exercise and discuss reasons for the str
5、uctures used.7. 小结v-ing 形式的用法1) ving 形式作状语用法例句时间Walking along the street, I met Mary. (= While I was walking along the street.)在街上走的时候，我遇到了玛丽。条件Turning to the left, you will find the school. (= If you turn to the left, .)向左走，你就会找到那个学校让步Knowing where I live, he never come to see me .(= Though he know
6、s where Ilive, .)尽管他知道我的住处，但从不来看我。伴随I stood there, waiting for her. (= , and waited for her.)我站在那儿等她原因Being tired , I stopped to take a rest. (= Because I was tired, .)因为疲倦，我停下来休息。结果It rained heavily, causing severe flooding in the area.(= It rained heavily so that it caused severe flooding in the a
7、rea.)在这个地方雨下的如此大，以至引发了洪灾。(Having been)+p.p. , 主语+谓语被动主动Having finished my work, I went home. (= After I had finished my work, .)工作做完只后，我就回家了。例句u ving形式的完成式所表示的时间在谓语动词之前u 表示被动可直接用过却分词用法Having +p.p. , 主语+谓语句型2) . 使用v-ing形式需注意的几个问题:.分词(短语)作状语时，其逻辑主语必须与句子的主语一致。如果不一致，必须用独立主格结构来表示，也就是在分词前面加上它的逻辑主语。 My wif
8、e had a long talk with Sally, explaining why she didnt want the children to play together我妻子与莎莉谈了很长时间，解释她为什么不想让孩子们在一起玩。(现在分词explaining是句子主语my wife做的动作，它们之间是主动关系,即explaining的逻辑主语，就是句子的主语my wife 。)The train having gone, we had to wait another day.（the train逻辑主语 + having gone 既为独立主格结构）分词短语做状语时，前面可以加上连词
9、或 介词，但是分词短语和句子之间不能用并列连词(如but，and)，因为并列连词接的是两个并列成分，而分词短语只是全句的一个状语部分。分词和主句之间可用逗号。例如:误: Having been told many times，but he still couldnt understand it.正: He was told many times, but he still couldnt understand it.或Having been told many times， he still couldnt understand it.v-ing的一般式和完成式现在分词都可以表示先后接连发生的
10、动作。在可能引起误解的场合应该用完成式现在分词表示先发生的动作。例如:Opening the drawer，he took out his wallet. (=He opened the drawer and took out his wallet.)他打开抽屉，拿出钱包。Coming into the room，he put down his bag. (=he came into the room and put down his bag.)他走进房间，放下提包。Having brushed his teeth，Mr. Brown came downstairs for breakfast
11、.布朗先生刷过牙，就下楼来吃早饭。 (此句如写成:Brushing his teeth, Mr. Brown came downstairs for breakfast.可能指“边刷牙，边下楼。分词的否定形式是在分词短语前面加上 not, never等否定词构成。例如: Not fearing the fire, the child touched and got a finger burnt. 小孩儿不知道怕火，用手去摸，把手指烫了。 Not knowing how to find the subway, I asked a policeman for help. 我不知道怎 样找到地铁，就去找警察帮忙。