1）现在完成时my father has been dead for three years.（注意：for要用在现在完成时,作这个时态的标志）2)一般过去式my father died three years ago.3)同样是现在完成时（这种时态用第一个方式说更好.）my father...如果是 ltis 3years 开头的呢？it is three years for my father to die应该是这样，这句式用得比较少。