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难点二、动词不定式和疑问词的连用
　　1． 疑问词+动词不定式
　　动词不定式可以和疑问代词如who, what, which及疑问副词如when, how, why等连用，构成不定式短语，在句中作主语、宾语、表语等成分。例如：
　　Who to call on the professor hasn’t decided yet. (主语)
　　He told me how to put the film on the camera. (宾语)
　　The question is when to get in touch with him. (表语)
　　注意：在与why连用时，只用于why或why not开头的简短疑问句中，后面紧跟的动词不定式不带to。例如：
　　Why not join us?
　　2． “with+whom/which不定式”结构
　　“with+whom/which不定式”结构是一种简洁的表达方式，指物时用which，这种结构中with有时可以是by, through, on, from等。这种结构通常用作后置定语。例如：
　　The boy got two dollars from the stranger with which to buy some other books.
　　男孩从陌生人那儿得到两美元，他用来给他自己买了其他几本书。
　　To be frank, she is not a nice person with whom to work.
　　坦率地说，她不是一个很好的合作伙伴。
　　巩固性练习：
　　1. ——Can the project be finished as planned?
　　——Sure, ____ it completed in time, we’ll work two more hours a day.
　　A. having gotB. to getC. gettingD. get
　　2. ——Is Bob still performing?
　　——I’m afraid not. He is said ____ the stage already as he has become an official.
　　A. to have leftB. to leave
　　C. to have been leftD. to be left
　　3. We went to the airport to see Mr. Smith off, but we hurried there____ the plane ____ off．
　　A. finding; takingB. to find; taken
　　C. finding; to takeD. to find; had taken
　　4. The flu is believed ____ by viruses that like to reproduce in the cells inside the human nose and throat.
　　A. causingB. being caused
　　C. to be causedD. be have caused
　　5. Helen had to shout ____ above the sound of the music.
　　A. making herself hearB. to make herself hear
　　C. making herself heard D. to make herself heard
　　6. ——Why do you look so sad?
　　——There are so many problems ____.
　　A. remaining to settleB. remained settling
　　C. remaining to be settledD. remained to be settled
　　7. I’d rather read than watch television; the programs seem ____ all the time.
　　A. to get worseB. to have got worse
　　C. that it is getting worseD. to be getting worse
　　8. Everyone here will thank the firefighters for the things they have done to prevent fires ____ the environment safer. 
A. makeB. to makingC. to makeD. from making
　　9. Pleasant as they made it ____, we felt tired after the long journey.
　　A. to travelB. travelC. traveledD. traveling
　　10. ——Really nice ____ you. I’m going to miss you.
　　——Don’t forget to give me a ring, will you?
　　A. knowsB. to know
　　C. to have knownD. knew
　　11. The party was successful, but we thought it a pity not ____ you.
　　A. inviteB. to invite
　　C. to have invitedD. inviting
　　12. The man we followed suddenly stopped and looked as if ____ whether he was going in the right direction.
　　A. seeingB. having seenC. to seeD. to have seen
　　13. ____ with such great difficulty, Jack felt at a loss ____.
　　A. Facing; what to sayB. Faced; what to say
　　C. Having faced; how to tellD. Being faced; how to speak
　　14. The teacher ____ at the desk ____ the exam papers.
　　A. sat; to be correctingB. sat down; to correct
　　C. sat; to correctD. was sitting down; correcting
　　15. With a lot of difficult problems ____, the newly-elected president is having a hard time.
　　A. settledB. settlingC. to settleD. being settled
　　16. The way you think of ____ our living conditions sounds reasonable．
　　A. improveB. to improveC. improvingD. improvement
　　17. I meant ____， but when I was leaving， I couldn’t find her anywhere.
　　A. to doB. toC. doingD. doing to
　　18. Charles Babbage is generally considered ____ the first computer. A. to inventB. inventing
　　C. to have inventedD. having invented
　　19. My advisor encouraged ____ a summer course to improve my writing skills.
　　A. for me takingB. me taking
　　C. for me to take D. me to take
　　20. The doctor examined the patient carefully, only ____ she was not seriously ill.
　　A. Key(2):1.B 2.A 3.D 4.C 5.D 6.C 7.D 8.C 9.A 10.C 11.C 12.C 13.B 14.B 15.C 16.B 17.B 18.C 19.D 20.B foundB. to findC. findingD. to be found

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