I believe that.中的that可以省略吗

I believe that.中的that可以省略吗 I don’t believe that man is killed by Jim,is he?宾语从句翻译：我认为那个人不是Jim所杀的,是不是?句中的that是“那个”的意思还是宾语从句的引导词?这句话是宾语从句吧.是不是说I don’t believe （tha i believe that.中文? I believe that I want to believe I BELIEVE 诗歌翻译I BelieveI believe that I don't have to change friendsif we understand that friend changeI believe that no matter how good a friend istheu're going to hurt you, every once in a whileand you must forget thar for thatI believe tha If you believe that I believe是什么意思 i'm firmly believe that 还是i firmly believe that just believe that i love I believe that everything you I can h______ believe that. I believe that I can do it Believe myself 翻译 I believe that I can forget I firmly believe that,I Love You! I believe that I will be happiness I believe that I will exceed you I believe that I will be happiness I Believe That I Can 歌词 I believe that everyone has his good friend.句子中的that有什么作用?为什么要加that?