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。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。
Grandpa Wang has died. 王大爷已经去世了。
The film has begun．电影已经开映。（现正放映）
这类动词不能和表示一段时间的状语连用。如：要表达\"王大爷已经去世两年了\"应这样写：Grandpa Wang has been dead for two years. 而不能写成：
Grandpa Wang has died for two years.
注：在for+时间段或 since+时间点的词组或句子上进行画线部分提问要用how long。同时用how long开始的句子中的谓语要用延续性的动词（时态不限）。
三、典型例题解答与分析
1. 词语练习：根据句意选择合适的词语填空。
1) －______you have locked the door.
－You needn’t worry about it. I _________I locked it before we left. (make sure, be sure)
2) Don’t worry! We’ll water the flowers as soon as we ______ home. (will arrive, arrive)
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