（纸）上说...是用it says...还是it said...还是别的?

（纸）上说...是用it says...还是it said...还是别的? 为什么不能说it says like that? 间接引语的谓语动词什么时候用一般现在时例如：he says that he is a student.这是课本上的句子我是说例句中为什么用says而不是said?什么情况下这样用? 张磊不喜欢历史,他说它没有用处（用英语怎么说）zhang lei——history.he says it is not— 他经常说帮助别人是他的荣幸 He often says it's _ _ _ help others. The weatherman says it is snowing today哪里错了怎么改?这是天下通上的 The radio says it ____rain tomorrow.(用be的正确形式填空） “他说”是 he said还是he says? she ____.是用asks 还是says 他说汉语很难说 She says it is dificult___ ___ Chinese 英语翻译我要全首的,中间有段歌词是[who says ,who says you are not perfect ,who says you are not worth it… she says,＂hello. 如果变为 ＂hello,says she.还是＂hello,says her.she says,＂hello. 如果变为 ＂hello,says she.还是＂hello,says her.says是动词,后面要跟宾格啊 可表达的意思是 她说 而不是 说她,说明原因 一个报告说我们一生中花在看电视广告上的时间大约是500天.A report says we spend about 500 days watching TV ads ______________________. In business,success not only depends on what one says but often on __ one says it.In business,success not only depends on what one says but often onhow one says it.success depends on what one says 为什么says后面不用加it?这是宾语从句吗? the redio says it will It's said+that从句,“据说……”,为什么不是It says+that从句It's said+that从句 是“据说……”的意思,为什么不是这样：It says+that从句?莫非It's said用的是被动语态,意思是“事情被说成是……”,所 My mother _____(说) she likes music very much.用says 还是 用 said我觉得是过去式,已经说过了,所以我认为要用said,但是答案是says, “花儿说”英文flowers says?