有没有说I have been American for three years.如果有为什么可以省去介词to

I HAVE NEVER BEEN,能否说I never have been 有没有说I have been American for three years.如果有为什么可以省去介词to I have been working hard all morning有没有什么语法错误有have been working这种说法吗 i have been there 和 i have been to china为什么一个有to一个没有?比如说：i have never been abroad,为什么不说成i have never been to abroad. have you ever been to HK和I HAVE been there for 3 years为什么一个有to一个没有 I have been successful是什么时态跟I have successed有区别么 具体说下语法结构谢了 请问：有没有must have been? 有没有这个说法:I mustn't have been a doctor.可以说mustn't`````吗? I have been to your city.有没有跟深层在含义? 我去过那三次是I have been there three times还是I have been there for three times 有没有for?为什么? 英语翻译你有没有听过 英文怎说?是have you heard 还是have you been heard i have been hiding in here all day 注意有没有in,有正确还是没有是正确的.英语翻译 to have been doing 和 having been doing 有什么区别,重点是have 和having说没有这两个语法现象的请绕道 I know the place where I have been fascinating by the nationality of Miao.这句话有没有语法错误? 【have been being 】or【have been being 】I have _____(be) a teacher in a high school in the rural area since I was twenty years old.填have been being还是 have been being?有have been being这种用法吗?如果没有,那现在完成进行时 have done,have been done,have been to do我看网上说,第一个是主动语态,第二个是被动语态,i have been to american,been 在这里是动词吗?所以是第一种have done?但是没有be to be to 没有去过某地的意思啊? 有没有been done 这个时态?注意,没有have where have you （ I have （ ）to the bank.A,been been B,gone been C.gone gone D.gone been 选哪个 我觉得是不是第一句话的问号后面没有to 是不是这里有什么决定的