5．It\'s our duty to keep our environment clean and tidy.
保持我们的环境干净整洁是我们的责任。
（1）it在这里是形式主语，真正的主语是\"to keep our environment clean and tidy\"
又如：It\'s a pleasant way to help keep our city clean.
（2）keen后面可跟带现在分词的复合结构。如：
He kept me waiting for a long time yesterday．他昨天让我等了很长时间。
keep后面也可跟带形容词的复合结构。如：
You should take more exercise to keep you healthy．你应该多运动来保持健康。
6．If everyone makes a contribution to protecting the environment, the world will become much more beautiful. 如果每人都对保护环境做出贡献，那么世界将变得更加美丽。
make a contribution to…意思是\"对……做贡献，捐赠\"。to是介词后跟名词或动词的-ing形式。例如：
（l）Thomas made a great contribution to the world．托马斯•爱迪生对世界做出了很大的贡献。
（2）It is our duty to make a contribution to protecting the environment．为环境保护做贡献是我们的责任。
make是英语中非常活跃的动词之一，和不同的词搭配具有不同的含义。又如：
make a face做鬼脸 make a living谋生
make a mistake犯错误 make friends with交朋友
make fun of开玩笑 make one\'s way挤出一条路
make room for让座 make up one\'s mind下决心
My friend Emma made fun of my job once time. She said that my job is rather making a living than career manage. I made up my mind to run my company successfully, which could make her realize she had made such a mistake. Then I made my way in mass society. I made good as a manager. I stay here and make sure that I have made a go of the business. I make of what Emma have done for me, luckily, I made friend with her.
7. The more trees, the better的结构
这里是\"the more，the more…\"句型表述结构，它的意思是\"越多越好；越……，越……\"。例如： Start your work, the sooner, the better. 开始工作吧，越快越好。
The more I think of it, the happier I am. 我越想越高兴：
The harder you work, the greater progress you will make. 你越用功，进步就越大。
The longer we stayed there, the more we like the people there.
我们在那里呆得越久，越喜欢那里的人民。
注意：在\"the more…，the more\"这个句型中，\"the\"不能省略。
8．… need to do better in protecting the environment. 需要在保护环境方面做得更好。
do well in在某方面干得好。do better in在某方面干得更好。
在in后面加名词或动名词。例：He does well in playing football．他足球踢得很好。
9．延续性动词与非延续性动词
(1) 延续性动词： 表示动作能够持续发生一段时间的动词。 《九年级英语总复习教案B3U3》出自：www.89xue.com网
www.89xue.com 如：
be, have, know, work, live, study, teach, speak, talk, draw, wait, wear, walk, sleep等。
Miss Gao has been here since 7:00.
高小姐七点起就到这儿了。（此句中不能用arrived或come）
I have had the bike for five years．这辆自行车我已经买了五年了。（不能用bought）
(2) 非延续性动词
表示一个动作刚刚发生即告结束。如：
come, go, arrive, reach, see, hear, close, leave, begin, start, lose, fall, join, die, get up等。它们可以用于完成时态的第一种，说明某个动作的结果还存在。但它们不可以用于完成时态的第二种。
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