I ____(have ) two serious accidents in my life.为什么用过去时而不用一般现

英语时态的两个句子 I had/ have had two serious accidents in my life.T You have saved my life;I shall never forget it.为什么用have不用had I have reached a point in my life ____ I am supposed to make While they were talking ,the bell rang.为什么后面不用过去进行时而用一般现在时 I have ____ seen such high waves in my life.An old man descr I have two bedrooms in my 阅读里的一道题.Many thousands of children have serious accidents in I have nerve been more sure my entire life.为什么不是 in my entir I have only been in America ____ two year.这道题答案为"for",这是为什么? I have an ____ in my head. l have two books in my schooi bag 一般疑问句 My life has changed a lot!为什么用has而不用 have