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2.—These farmers have been to the United States. —Really?When there? A.will they go B.did they go C.do they go D.have they gone 答案： 2.B 现在完成时与一般过去的区别：一般过去时表示过去某个时间发生的事、存在的状态或经常发生的动作，说话的侧重点在于陈述一件过去的事情，与现在没有关系;现在完成时表示与现在有关系的发生在过去的动作，它不与表示过去的时间状语(如yesterday,last week,a moment ago等)连用。 3.— you your homework yet? —Yes.I it a moment ago. A.Did;do;finished B.Have;done;finished C.Have;done;have finished D.will;do;finish 答案： 3.B 4.Miss Green isn’t in the office.She to the library. A.has gone B.went C.will go D.has been 答案： 4.A “have/has gone to+地点”表示“某人去了某地(还未回来)”，指主语所指的人不在这儿。“have/has been in+地点”表示“在某地呆了多长时间”，常与表示时间的状语连用。“have/has been to+地点”表示“曾经去过某地(但现在已不在那儿)”。 5.My parents Shandong for ten years. A.have been in B.have been to C.have gone to D.have been 答案： 5.A 6.It ten years since he left the army. A.is B.has C.will D.was 答案： 6.A 可用“It is+一段时间+since从句”来表示。 ●Sentence structure training (句子结构专练) Ⅴ.Rewrite the following sentence according to the request in the parentheses. (根据括号中的要求改写下列句子。) 1.He is going to Shanghai.(用现在完成时) 2.I heard about the news about the space travel.(改为同义句) 3.Scientists have found life on other planets.(改为否定句) 4.They haven’t been to Mars.(用yet) 5.The spacecraft has reached the moon.(用just) 6.Many astronauts have visited the space station.(用already) 答案：Ⅴ. 1.He has gone to Shanghai. 现在完成时的结构是“S+have/has+P.P ”,本句主语为第三人称单数,而go的过去分词是gone。 2.I heard of the news about the space travel. hear of的同义短语为hear about。 3.Scientists haven’t found life on other planets. 现在完成时的否定式是在have/has后直接加上not。 4.They haven’t been to Mars yet. 我们在学现在完成时的时候,经常会出现already,just,yet这三个词,它们在句中的位置分别是already,just放在have/has与过去分词之间,yet放在句末。其意分别为“已经,刚刚,还”。 5.The spacecraft has just reached the moon. 6.Many astronauts have already visited the space station. (责任编辑：admin) |