动词-ing形式作表语【归纳】动词-ing形式作表语，说明主语的内容，常指一般性、经常性的动作。如：My job is looking after the children.Susans hobbies are reading and cooking.One of his bad habits is smoking while having dinner.Martins duty is cleaning the cars.一些表示状态、品质等的动词-ing形式具有形容词的性质，也可作表语，表示主语所具有的特征或属性。这时系动词可以是be, become, get, look, seem, appear, sound, feel, keep等。如：Skiing is more exciting than skating.Its amazing how often you see drivers using mobile phones.The speech he gave this morning is inspiring.The programme for the weekend looks exciting.The news from the doctors doesnt seem very encouraging. The story sounds really interesting. 动词-ing形式作宾语补足语【归纳】动词-ing形式可用在感官动词（如hear, see, watch, find等）或使役动词（如leave, have, keep, get等）后作宾语补足语，表示主动或进行意义。如：I could hear someone calling my name.I saw the people entering the theatre, and there were 300 of them.Ruth doesnt want to watch her parents arguing.When we arrived, I found the old man lying on the floor. Dont leave the water running while you brush your teeth.She had me doing all kinds of jobs for her.My friend kept me talking on the phone for half an hour.Havent you got the computer working yet?动词-ing形式也可用在with复合结构中作宾语补足语，同样也表示主动或进行意义。如：With a native villager acting as our guide, we had no trouble getting around.The old couple often take a walk after supper in the park with their pet dog following them.【拓展】 动词-ing形式也可作主语补足语。如：John was caught cheating in the last exam.The man I talked to was seen going upstairs.The girl was heard singing all the time.【综合练习】I. 从a-f中选择合适的内容填入1-6的空格中（每项限用一次）。1. Its difficult to keep them _. They need to rest. 2. I think your leaving without a word is enough to start your parents _. 3. When I saw smoke _, I called the police at once. 4. The couple caught the thief _ when arriving home. 5. The police said that the boy was last found _. 6. I can hear someone _. Lets go to see what happened. a. wandering on a country road b. coming from the forestc. worrying again d. opening the safee. shouting in the distance f. working all the timeII. 用括号内动词的正确形式完成下面短文。Alcatraz Island, 1. _ (lie) in San Francisco Bay, served as a prison from 1934 to 1963. It housed several infamous criminals.Robert Stroud, 2. _ (know) as the “Birdman of Alcatraz”, spent 17 years on “the rock”. Al Capone, who continued running his rackets from behind bars by buying off guards, arrived in 1934.It was 3. _ (terrify) to stay in prison for so many years, but prisoners 4. _ (hold) in Alcatraz knew that escape from the island was impossible. Prisoners 5. _ (attempt) to escape were either caught, shot or drowned in the bay.The prison, 6. _ (grow) old and too expensive to operate, was closed in 1963. In 1969, Native Americans, 7. _ (claim) the island as theirs, were peacefully moved off the island. Currently, Alcatraz Island, 8. _ (choose) as a National Historic Landmark, serves as a cultural center, tourist destination and site for filming movies.答案I. 1-f 2-c 3-b 4-d 5-a 6-eII. 1. lying 2. known 3. terrifying 4. held 5. attempting 6. growing 7. claiming 8. chosen