Her grandfather died seven months ago.(改为同义句)
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Her grandfather died seven months ago.(改为同义句)

Here grandfather __has__ __been_ __dead__ for seven month.

一般过去时换现在完成时

did sth some time ago=has done for some time.

has been doing是现在完成进行时,指从以前做起,一直到现在都在做,还有可能继续做下去.

而has done是现在完成时,主要有2种意思

(1)指从以前做起,一直到现在都在做,还有可能继续做下去.

(2)以前发生的事对现在有影响.

所以可用has been doing的地方都可用has done

而has been dead中been 是done的形式,dead是形容词