There were many stones in the mountains three years ago .(改为现在完成时) 怎么改

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There were many stones in the mountains three years ago .(改为现在完成时) 怎么改
There were many stones in the mountains three years ago .(改为现在完成时) 怎么改

There were many stones in the mountains three years ago .(改为现在完成时) 怎么改
There have been many stones in the mountains for three years.

there have been many stones in the mountains three years before.

There have been many stones in the mountains years ago .

这句话应该不可以该。因为本句中有一个明显的时间点three years ago.这一过去时间短语决定了这句话必须是过去时态,所以根本无法改为现在完成时。