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Many science-fictional ideas from the past have subsequently became scientific realities. Take space exploration, for example. In the 1950s this was j...
Time travel is clearly a trickier proposition than space travel, though. Put simply, Einstein's idea was that every object in the universe has it...
The experiment was replicated in 1996 with advanced technology, and it was proved again——with an even bigger time difference this time. Which proves...
If it were possible, however, it would present some pretty knotty paradoxes…… For example, what if someone or something traveled back in time and ...
Many science-fictional ideas from the past have subsequently became scientific realities. Take space exploration, for example. In the 1950s this was j...
1.She was so angry at all ____he was doing _____she walked out without saying a word. A. that, that B. which; that C. what; as ...
1. You _________in such a hurry just now. Look, there is plenty of time left. A. don't have to do it B. needn't have done it C. would...
1.She was so angry at all ____he was doing _____she walked out without saying a word. A. that, that B. which; that C. what; as ...
1. _____the children to bed, she began to correct the students' exercises. A. Sending B. Being sent C. sent D. Having sent 2. Nobody noticed...
1. _____the children to bed, she began to correct the students' exercises. A. Sending B. Being sent C. sent D. Having sent 2. Nobody noticed...
用一般过去时代替完成时 1) 两个动作如按顺序发生，又不强调先后，或用then，and，but 等连词时，多用一般过去时。 When she saw the mouse，she screamed. My aunt g...
过去完成时典型例题 The students ___ busily when Miss Brown went to get a book she ___ in the office. A. had written, left B. were writing, ha...
过去完成时 1) 概念： 表示过去的过去 其构成是had +过去分词构成。 那时以前 那时 现在 2) 用法 a.在told, said, knew, heard, thought等动词后的宾语从句...
延续动词与瞬间动词 1)用于完成时的区别 延续动词表示经验、经历; 瞬间动词表示行为的结 果，不能与表示段的时间状语连用。 He has completed the work. 他已完成了那项...
since的四种用法 1) since +过去一个时间点 (如具体的年、月、日期、钟点、1980, last month, half past six)。 I have been here since 1989. 2) since +一段...
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