it is said that they moved off at 8 o' clock.

问题描述:

it is said that they moved off at 8 o' clock.
因为是at 8 o' clock有过去的具体时间,所以用 moved .
若没有具体的时间呢?句子要怎么改?

若没有具体时间,有两种改法,强调重点略有不同
1.It is said that they have moved off.
听说他们已经搬走了(强调已经搬走了)
2.It is said that they moved off.
听说他们搬走了(只是说在过去搬走了)