Question

初三英语....

they left the company five months ago 改同义句they __ __ __ __ the company __ five months ago
还有一个 her grandpa died six weeks ago也改同义句 her grandpa __ __ __ __ six weeks 顺便告诉下我为什么, 这单元学现在完成时

Answer 1

they (have been out of) the company (since) five months ago.
Her grandpa (have been dead for)

题目要点是把过去时转换成完成时：现在完成时强调从动作发生到现在，强调状态。一般过去时陈述事实已然的动作。

第一句：他们五个月前离职（离职发生在过去，是五个月前）
换成：他们离开公司（的状态）已经有五个月了。

第二句：她的奶奶六周前去世。(去世发生在过去，六周前。强调去世这一动作)
换成：她的奶奶去世（的状态）已经有五个月了。（强调去世这一状态）

Answer 2

they left the company five months ago 改同义句 they have left the company since five months ago

her grandpa died six weeks ago改同义句 her grandpa has been dead for six weeks

Answer 3

have been away from
since
has been dead for