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《Appendix VI： Kinds of Sentences》名校名师PPT课件（新世纪版九年级下册）
To fly like birds is impossible for men.
To protect the earth is our duty.
1.It’s nice of you ____ us so much
advice.
A. give B. giving
C. to give D. given
Have a try
2.____ your ambition is not easy.
A. To achieve B. Achieve
C. To achieving D. Achieved
A
C
Have a try
The purpose of sugar is of course
____ the medcine.
A. sweet B. sweets
C. to sweet D. to sweeten
D
2. A fireman’s job ____ fire.
A. to put out B. is putting out
C. is to put out D. put out
C
Infinitive used as …….?.（v.+ to do）
want to do decide to do hope to do
plan to do agree to do promise to do