直接宾语改为间接宾语什么情况时态不变?

①直接引语是客观真理.
"The earth moves around the sun and the moon
moves around the earth, the teacher told me. → The teacher told me the earth
moves around the sun and the moon moves around the earth.
②直接引语是过去进行时,时态不变.如：
Jack said. "John, where
were you going when I met you in the street?"→Jack asked John where he was going
when he met him in the street.
③直接引语中有具体的过去某年、某月、某日作状语,变为间接引语时,时态不变.如：
Xiao Wang said. "I was born on April 2l, 1980." →Xiao Wang said
he was born on April 20, 1980.
④直接引语如果是一般现在时.表示一种反复出现或习惯性的动作,变间接引语,时态不变.如：
He said, "I get up at six every morning." →He said he gets up
at six every morning.
⑤如果直接引语中的情态动词没有过去时的形式（例：ought to, had
better, used to)和已经是过去时的形式时,（例：could, should, would, might）不再变.如：
Peter said. "You had better come have today." →Peter said I had
better go there that day.

①直接引语是客观真理。
"The earth moves around the sun and the moon
moves around the earth, the teacher told me. → The teacher told me the earth
moves around the sun and the moon moves around the e...