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北师大2003课标版《Lesson 3 Your Money》最新PPT课件优质课下载
The sand contains materials to keep the natural balance of the area.
… this has destroyed almost all the land, and has forced many local farmers to move to other areas.
to keep used as Attributive
Presentation
3. It is a huge job to control Yellow River
erosion.
4. This helps to develop local economies.
5. So when you have 5 yuan in your
pocket next time, think twice about
how to use the money.
to control used as Subject
to develop used as Object of “help”
how to use used as Object of the phrasal verb “think about”
6. On land with rich soil, local farmers can grow crops to make a living.
7. Visitors from all over the world now come to admire this great achievement.
to make a living used as Adverbial of purpose
to admire used as Adverbial of purpose
动词不定式
不定式由to +动词原形构成，其否定形式是not to +动词原形。不定式可以带宾语或状语构成不定式短语，没有人称和数的变化，但有时态和语态的变化。不定式可作主语、宾语、状语、表语和定语，但不能单独作谓语。不定式的逻辑主语可由for +名词或代词宾格构成。
不定式的用法
(1) 作主语。不定式短语作主语时，往往
放在谓语之后，用it作形式主语。
To see is to believe.
It is right to give up smoking.
(2) 作宾语。不定式短语作宾语时，如果