i sleep for eight hours.中的for必须用吗?

i sleep for eight hours.中的for必须用吗? sleep、eight、for、day、a、i、hours怎么写成句子 I sleep eight hours for every night. 和 I sleep for eight hours every night.哪个对? Ho,ho,ho Ho,ho,ho Ho,ho,ho And i pray I just can't sleep tonight knowing that things aren’t 这首歌的歌名是什么? I think it's important for us ____(sleep) eight hours a night.为什么填to sleep? I sleep eight hours a day 就eight提问快 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? I think is necessary for us to sleep for eight hours everyday.同义句I think __ __ for us to sleep for eight hours everyday.漏掉了，是 I think it is necessary for us to sleep for eight hours everyday.同义句 _________ necessary for students ________ sleep eight hours every night We should sleep at ( ) for eight hours a day I sleep _____ (大约) eight hours every day. .Every night I sleep eight hours.（对划线部分提问） 划线部分为eight. 九尾狐中的ho i ho I sleep for nine hours every night it is n_ for you to sleep eight hours every day. eight hours' sleep 同义词 是不是eight-hour sleep i usually sleep eight hours every night 就“eight”一词进行提问_____ _____ _____ do you usually sleep every night? 英语翻译I _________________ ____________________ ____________________ __________________ sleep eight hours a night