英语语法 第四题 为什么这句话用has而不是does?

英语语法 第四题 为什么这句话用has而不是does? 英语语法：以下句子为什么用for?He has been there for six months.请问这里为什么用 for?这是新概念第二册第四课. 英语语法,hardly did i think it impossible这句话为什么有did还用think而不用thought,还有it后面为什么不用is,谢谢 Scientists think there has been life on Earth for millions of years.拜托各位了 3Q这句话为什么用has而不用have呢? He has the same computer as I.这句话中为什么用I而不用mine.我觉得应该是用mine 才正确 what has he got 这句话中为什么要用has啊,what 后单3要变has? 简单英语语法问题,如下“the fans would love anybody who played Jacob,”the boy has said.i'm just lucky to be the one who got the chance.这句里面为什么要用 has said,而不用said,两者用法的区别是什么? 这有一个英语语法题,关于强调句型.it is professor Li who teach us English为什么不用that而用who 英语语法（给你选为标准答案）他过去吃肥肉这句话用过去式还是be used to doing sth为什么, 这句话 是否有语法错误Overall,the outlook for economic growth has worsenedOverall,the outlook for economic growth has worsened为啥用 has 而不用was 英语语法 whereThe helicopter has now become an extremely useful machine.It excels in military missions,carrying troops,guns and strategic instruments where other aircraft cannot go为什么这里用where 而不用which啊 第四题,为什么不选A而选C? 一个简单的英语语法My father has been at rest since I was a girl.在我还是小女孩时,我父亲就已去世了.在这句话中为什么后面since I was a girl前面还用现在时,能这样用吗,不懂,请讲讲, This ring has been passed on in my family from mother to daughter.这句话为什么用现在完成时?如题 英语语法第三人称单双数请教1、it has big ears.has 用于第三人称单数,虽然 it 是第三人称,但 ear 加了s ,已经是复数了,不再是单数,为什么还用 has ,而不用 have 2、does she have small hands 道理同上,she He has lived here since 1992.这里为什么用has lived而不用has been living? he has been married for six years.为什么用has been married 而不用has married? he is always acting the experienced man who has seen everything这句话中为什么用acting而不用act 还有后面的从句中为什么要用现在完成时,