His grandpa died five years ago.转化成-----five years---his gra

如果第一个空格只能填一个词的话,那么应该是：__It's_five years__since_his grandpa__died__。如果是完整的说法,应该是：__It has been___five years_since__his grandpa__died__。其中,第一种说法是第二种说法的简单形式,多用在美语口语中。