it is said that不一定的.
It is said that he was back last night.
It was said that倒是用过去时的.
It was said that he had come the night before.
soon当然可以用过去时了.
He was soon released,with a warning not toplay the song again.
他很快就被释放了,但受到警告以后不能再唱这首歌.soon不是将来吗soon很快，不久的意思，可用于将来，也可用于过去时的。如：If you apply yourself to the job in hand,you'll soon finish it.如果你努力做手头的工作，你会很快把它做完的。Soon he fell behind in the race.很快他在赛跑中落在了后面。