there has been的用法

there has been的用法 there has/have been的用法 has been的用法 has been in的用法 has been doing 的用法 there have been 的用法 He has been there (for)six months.这句话里 for 的用法 ,以及能不能省略. has been to的主要用法 关于has been用法 关于has been和have been用法的 has been 和 had been 的用法和差别 求has been for的具体用法和与has been to,has gone to, has been in, ha