My grandfather just passed his seventy-ninth birthday a couple of days ago .
问题描述：
My grandfather just passed his seventy-ninth birthday a couple of days ago .
翻译并解释此句语法结构.
答
我的祖父前几天刚刚过完他79岁的生日.
a couple of days表示几天的意思,前几天过得 所以用过去时