he told it is not possible哪里不对

he told it is not possible哪里不对

He said it was not possible.

he told that is not possible

应该是was

is 应改为was，因为主句是过去时（told），所以宾语从句的时态应与主句一致

told改成said

句子结构不对，that he told it is not possible，这样加个主语从句引导词就对；