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1、Over+时间短语 时态用法总结WORD CHOICE: since, for, during, overUse since to say that something started at a point in time in the past, and is still continuing : He has been living in Leeds since 1998. | Weve known about it since May. Since is usually followed by a time expression (last year, this morning, 4 o
2、clock etc) or by the simple past tense. Use the present perfect or the past perfect in the other clause : I have loved movies since I first went to the cinema. |He had been seriously ill since Christmas.! Speakers of British English usually say it is a long time/two weeks etc since ., and speakers o
3、f American English it has been a long time/two weeks etc since ., but both uses are correct : Its weeks (BrE)/Its been weeks (AmE) since I saw Grandma.Use for when you state the length of time that something has been happening : We have known each other for ten years (NOT since ten years). | I had b
4、een waiting for hours (NOT since hours). |I havent seen him for ages (NOT since ages).During and over are used when you state the period of time in which something happens or changes : During her first year at college, she had several boyfriends. | Over the last six months, crime has doubled.“over t
5、he past/last +时间短语 “修饰句子谓语，表示 during/through 用现在完成时 新prep-188. Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are now drawing solid conclusions about how the human brain grows and how babies acquire langua
6、ge.新PREP-224. (GWD-12-Q13) Although energy prices have tripled in the United States over the last two years, research indicates that few people have significantly reduced the amount of driving they do or made fuel efficiency a priority when shopping for cars.旧 PREP138 According to scientists at the
7、University of Alaska, while the surface temperature of the globe has risen over the last century by about one degree Fahrenheit, the surface temperature in Alaska, Siberia, and northwestern Canada has increased over the last thirty years by about five degrees.大全 409 In the last ten years, the dropou
8、t rate among Black high school students has fallen substantially, while the number of Blacks attending college has more than doubled大全 986 Turkeys economy has grown prodigiously over the past ten years, with an average annual increase of about eight percentone of the highest growth rates in the worl
9、d.特例：新prep-220. (GWD-24-8) The results of the companys cost-cutting measures are evident in its profits, which have increased five percent during the first three months of this year after falling over the last two years. 新PREP-257. (GWD6-Q30) Though subject to the same wild-animal control efforts th
10、at killed off almost all the wolves in North America over the past century, the coyote, because of its amazing ability to adapt to the presence of humans, has been able to expand its range into Alaska and Central America.大全142 As U.S. nuclear attack submarines prowl their familiar haunts deep within
11、 the oceans of the world these days, they increasingly are engaged in missions far different from the tasks for which they were built and for which their crews were trained over the last forty years.“over the past/last +时间短语 “修饰句子宾语，不影响动词的时态 旧 PREP2-119. After determining the levels of calcium carbo
12、nate and the types of fossilized algae present in core samples taken from the bottom of Lake Titicaca in the Andes, a group of scientists was able to reconstruct the history （of precipitation in tropical South America） over the past 25,000 years. 这个句子，over the past 25,000 years 修饰的是 the history，自然与
13、reconstruct 这个动作无关了。大全 775 The main reasons for the phenomenal growth （ of agribusiness over the last fifteen years） are elevated land prices, retail marketing networks based on produce imported from other states, and decreased competition from developers. 这个也一样，over the last fifteen years 修饰的是 grow
14、th，不影响后面的动词形态。Over the next+时间短语 要用将来时，will/could/would大全 726 The delinquency rates on mortgages for office buildings, hotels, shopping malls, and other commercial properties held by the nations insurance companies have increased sharply in recent months, leading to predictions that foreclosures on
15、these types of loans could double over the next three years大全 023 Tiny quantities of more than thirty rare gases, most of them industrial by-products, threaten to warm the Earths atmosphere even more rapidly over the next fifty years than carbon dioxide will大全 976 Seeking to spur science education,
16、the National Science Foundation will spend $25 million over the next ten years to promote science in elementary and secondary schools大全 976 Seeking to spur science education, the National Science Foundation will spend $25 million over the next ten years to promote science in elementary and secondary schools大全 726 The delinquency rates on mortgages for office buildings, hotels, shopping malls, and other commercial properties held by the nations insurance comp
