为什么说:He has waited for 3 days而不是He waited for 3 days?

为什么说:He has waited for 3 days而不是He waited for 3 days? He has waited some time.为什么不用for?这里some time做什么成分? It was recommended that they （ ） for the doctor.A.has waited B.waited C.wait D.It was recommended that they （ ） for the doctor.A.has waited B.waitedC.wait D.should have waited我选C,不是说这种句型后面应该是(should) do嘛为什么 为什么不说he has gone 而说he is gone (Having waited)in line for half an hour ,Tom suddenly realized that he had left his wallet at home为什么不用To have waited 而用Having waited he has waited for him as long as two hours ,only--- -----（A.to be told B.being told)that he won't横线上应选择A还是B,为什么 The clients( ) the lawyer for half an hour because he is still having a meeting. A.have waitedB.have been waiting for C.has waited D.are waiting for理由也说一下 they waited for the bus 否定句； 一般疑问句； 肯定回答； 否定回答； he has five stickers He has his car waited out of the gate of our school这句话的句子结构怎么分析 hurry up jeff has arrived there don't worry he won't mind__for usa;to waitb;waitc;a thed;waited he has flu说成he has a flu行吗? He's dead 和he has been dead的关系..he has been dead是现在完成时.没有语病..那为什么说he's dead也可以?..是不是那个been可以省去?还有he's是不是等于he has.. 英语改错 He had his brother waited for him outside是把waited 改成waiting 我知道.但是为什么要加ing Three years has passed since he came to China.中为什么用has不是说three years吗 Time and tide __ for no man.A.waitB.waitedC.is waitingD.has waited为什么?不能选C? I am waiting .He waited.感觉好像第二句不太对 但不是说wait可以做不及物动词的吗? He has no books 还是he has not books,为什么 He has f.all over the world