如果主句是现在时或将来时,改为间接引语时,时态不用改变。
eg.原句改为间接引语:
He asks( that ) if he is sure that his/her mother will come. 这句话里从句还是用将来时。
如果主句时态是过去时,则间接引语的动词时态应该变化。
改为间接引语时,一般主从句前后时态要一致。也有主从句时态不一致的情况。例如:He told me that the earth runs around the sun. ?/ I think that it was Tom who did the good deed.
不一定,要看情况。