IF 虚拟语气句型：不论主语是单数还是复数，其虚拟语气动词都只能用过去式，be 动词只能用 were。表示与实际情况不一致，亦或表达某种愿望或期望，本句表示与对未来的愿望。注意，现代英语语法也允许使用 be 动词的 was 形式接单数主语。
What If an Asteroid Hit Earth?Holly Cefrey
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The chances of Earth actually being hit by an asteroid large enough to cause damage are very small.12. What is the purpose of the DART? A. To test whether scientists' ide a is true or not. B. To know the weight of the asteroids going around the Sun. C. To learn about the number...
What will happen to the earth once the sun dies? What is the difference between a bolide and a meteor? Did anyone die from the meteor that hit Chelyabinsk? How big is a meteorite before impact? How did an asteroid impact cause extinction on Earth? What is a super bolide meteor? Was th...
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￭主要从句中也是用过去完成的形态：might是过去形态的拼法，havedone是原型 动词的完成时。三、未来时间例3.Ifanasteroidshouldhittheearth,mancoulddieout.（如果小行星撞地球，人类可能会灭绝。）￭条件从句中用过去形态但不表示过去式的shouldhit来表示非事实。￭主要从句中也是用coulddie来表示非事实。如果是绝...
Planet Earth would be a scary place for humans if dinosaurs still ruled the world.Though there are still some traces of life from the Jurassic Period, the Age of Dinosaurs more than 65 million years ago. This mass extinction is believed to be the result of an asteroid (小行星) hitting Ea...
These herbivores (食草动物) were decreasing in population after the asteroid hit Earth, which left the meat-eating species less food to survive on. “In any ecosystem where you remove links to key species, that community has problems," Richard Butler, one of the review's authors, told ...
阅读理解 Scientists are worried that an asteroid(小行星)will possibly hit the earth in 2036.If scientists are right planet earth is 24 years away from a major disaster. Scientists h