词形变化( Word Form )应试技巧 1.熟练掌握动词词形变化规律。注意：动词形式既包括谓语动词的各种形式，如时态、语态及语气(直陈、虚拟)等，虚拟语气为重点，几年来的考题中都有这方面内容;也包括非谓语动词的各种形式。所以做动词的词形变化时，首先要搞清楚它在句中是谓语动词还是非谓语动词，然后再作相应的变化。
1)动词的时态：重点是动词的过去时、完成时。 So far， Irving ______(live) in New York City for ten years. has lived Many a writer of newspaper articles_______(trun) to writing novels during the past decade. has turned Some people think relations between people _______(deteriorate) so much that understanding and friendship are almost impossible . have deteriorated Nearly a week passed before the girl was able to explain what _______(happen) to her. had happened In the past two decades， research _____(expand) our knowledge about sleep and dreams . has expanded
2)动词的语态：主要掌握各个时态的被动式。 The nations that _______actively ________(involve) in earthquake prediction programs include Japan， Russia， and the United States. are involved There __________(estimate) to be more than 20，000 overseas domestic servants working in Brtain in 1995. were estimated
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