请解释一下这个句子的时态问题It has found that the highest scores on vocabulary tests have been made by people getting the highest pay.为什么用了两个现在完成时?has found 和have been made

请解释一下这个句子的时态问题It has found that the highest scores on vocabulary tests have been made by people getting the highest pay.为什么用了两个现在完成时?has found 和have been made it has often broken down.是一句什么时态的句子, 句子的时态问题Look,she has a bunch of flowers in her hand.这个句子为什么用过去时has,而不用进行时is having?这个句子为什么是一般现在时，我看错了！ 英语翻译并请解释一下句子时态和语法关系. since从句的时态问题It is/has been +时间段+since从句中since的从句的时态 一个分析英语句子结构的问题,English has been spoken in the southeast of scotland for as long a time as it has been spoken in england这个句子的结构是什么?for as long a time as it has been spoken in england充当什么结构?请 2.The price ____ ,but I doubt whether it will remain so.A.went down B.will go downC.has gone down D.was going down 选择B对吗?这是虚拟语气的句子还是whether引导的名词从句.还有在这个句子中时态怎样用啊?请高人帮我 It’s reported that by the end of last month the sale of the company ______ by 10%.A.has risenB.had been rising C.had risenD.has been rising 这个句子考查的什么时态呀? has been 还有,解释一下has+been+过去分词的用法,是什么时态之类的. He has made greatprogress recently --( ) ,and ( )A So he has ,so you have B So he has ,so have youC So has he ,so have you D So has he ,so you have会的请解释一下原因并翻译这个句子并说明so he has so has he / so you have so have you if only引导句子的时态问题 It suddenly occured to one of the workers to open up the box. 突然一个工人想到打开箱子看看. 请解释一下这个句子的语法. He has bought it 这个句子对吗 She is still doing it.这个句子时态对吗 it's got be ok 帮我解释一下这个句子的语法吧, I'm going shopping请划分一下这个句子的成分和时态 名词性从句的有关问题,1.I have learned from my bitter experience ____we don't know_____we've got until it's gone.A.that; that B.what;what C.that;what D.which;that 请解释一下这个句子的意思2.The one man was so angry and spoke so fa when do we have to be doing the research?有谁能解释一下这个句子的语法吗?特别是be doing这里 是什么时态?