关于时态的英语题I have worked here for 20years.I have been working h

(1) 现在完成时可以表示一个已经完成的动作,而现在完成进行时则表示一个正在进行的动作：I have read the book。我读过这本书。I have been reading the book。我一直在读这本书。【注】有少数动词(如work,study,live,teach,stay等)在表示持续一时间时用这两种时态含义差不多(只是用现在完成进行进更强调动作的持续性)：How long have you worked [been working] here?你在这儿工作多久了?I’ve lived [been living] here since 1988。自1988年以来我就一直住在这儿。(2) 现在完成时通常只陈述事实,而现在完成进行时还可表示一种感****彩：I have waited for two hours。我等了两小时。(陈述事实)I have been waiting for two hours。我等了两个小时。(等得好辛苦)(3) 现在完成进行时通常用来谈论较短暂的动作或情况,若要谈论时间延续较长的动作或情况或永久性情况,则通常用现在完成时：He has lived in Paris。他(一直)住在巴黎。He has been living in Paris。他(目前)住在巴黎。(表暂时性)(4) 不用于进行时态的动词通常也不用于现在完成进行时,但它们可以用于现在完成时：I’ve only known her for two day。我认识她刚刚两天。They’ve been married for twenty years。他们结婚已二十年了。The war has lasted for a long time。这场战争持续了很长时间。(5) 现在完成进行时不用于被动语态,若要用可用现在完成时的被动语态代替：The house has been painted for a month。这房子已漆了一个月。The problem has been studied for five days。这个问题已研究了五天。