3. 过去完成时 - had been/ been doing/ been done1) 定义：过去完成时，该时态表示的是，某个行...
没有have be done这种时态，一般是have been done，表示现在完成时。例句：The marshes have been drained. 沼泽地里的水已排干。
1、have+been +过去分词，构成完成式被动语态。例如：English has been taught in China for many years.中国教英语已经多年。2、现在完成进行时构成：have / has been +现在分词。例如：How long has it been raining?雨下多久了？现在完成时介绍 现在完成时( The Present Perfect Tense)是过去的动...
have been doing 这 3 种时态？语法书上的那些解释，看来看去都不是很能理解，也谢绝照搬语法书的解...
(The Present Perfect Tense)是过去的动作或状态持续到现在,或对现在造成的影响,可能持续发生下去。 它的构成是:主语+have/has +动词的过去分词。 ①助动词have/has可以与主语缩写为’ve/’s。 I have → I’ve, We have → We’ve,He has → He’s,It has → It’s ...
have been是现在完成时。加上过去分词是被动语态，应当作be done来理解。have been是be的现在完成时形式，通常可与表示职业的名词连用，也可和表示地点的介词短语连用。还可与away，back等小品词连用。现在完成时( The Present Perfect Tense)是过去的动作或状态持续到现在，对现在造成的影响，可能持续...
1、have+been +过去分词，构成完成式被动语态。例如：English has been taught in China for many years.中国教英语已经多年。2、现在完成进行时构成：have / has been +现在分词。例如：How long has it been raining?雨下多久了？现在完成时介绍 现在完成时( The Present Perfect Tense)是过去的...
那么hypothesis为何不对?其英文释义为:an idea or explanation of something that is based on a few known facts but that has not yet been proved to be true or correct,看完这个释义,“少量的事实但未被证实”,你还会觉得符合吗? 本题原句也来自George Orwell的1984 ...
have been and+past participle的含义 英国作家W.Thackeray的名著"Vanity Fair"一书中有这样一句: Sir Pitt has been and proposed to marry Miss Sharp. 有人曾将此句译为:"毕脱爵士来过了,求着夏泼小姐嫁... 孟伟根 - 《大学英语》 被引量: 0发表: 1993年 Weird past tense forms. But the actual ...