I sleep for nine hours every night

I sleep for nine hours every night I never sleep for less than nine hours.中文是什么? I sleep nine hours every night.这句话表达正确吗?I sleep for nine hours every night.这两句没什么区别吗? 【句型转换】I sleep for {nine} hours every night .(就｛｝部分填空) ------ ------ ------ do you slee 【句型转换】I sleep for {nine} hours every night .(就｛｝部分填空) Usually I sleep for eight or nine hours a night.中为什么要用介词for而不用介词about? Studdents must sleep for about nine hours every night? i need nine hours' sleep every night.改为同义句 i need nine hours' sleep every night.改为同义句 i sleep nine hours every night.对划线提问（nine）______ ______ hours do you sleep every night? I sleep nine hours every night.(划线提问)划的是nine _____ _____ _____ do you sleep every night? Nine.I need lots of sleep. sleep nine hours和sleep for nine hours两者都在文中见过,到底哪个是正确还是都正确,为什么,不应该家for吗 Children should sleep for nine hours every night对for nine hours提问____ _____ time should children sleep erery night i sleep nine hours every night 划线提问______ ______ hours do you sleep every night?1.i sleep （nine hours） every night2.i sleep （nine） hours every night这两个划线提问一个划nine hours一个划nine二者有何区别分别该填 i sleep nine hours every night 划线提问______ ______ hours do you sleep every night?1.i sleep （nine hours） every night2.i sleep （nine） hours every night这两个划线提问一个划nine hours一个划nine二者有何区别分别该填什 for后跟一段时间的时候可否省略?可以说 They sleep less than nine hours吗 It is important for children ____(sleep) nine hours a day