是sleep for an hour 还是 sleeping for an hour

是sleep for an hour 还是 sleeping for an hour After lunch,I sleep for an hour ( ) (one) Some doctors work for 72-hour without sleep.为什么72-hour是错的? After lunch,I sleep for an hour ( ) (one)用所给词的正确形式填空 for an hour They talked for half an hour.请问 for half an hour是talked的状语吗? 填空（词或词组）：He——（形成规律）to walk for an hour before going to sleep. i danced for an hour. i usually go running for half an hour对划线部分提问线是for half an hour he runs for half an hour every morning 对划线部分提问画线的是 for half an hour for an hour 和an hour有什么不同. for hour 和 per hour的区别听力中常常分不清for 和per 的发音,想问下1 for hour是否是正确表达,也是每小时的意思2 看到有两种用法,for an hour 是否等于 for hour He watches TV for half an hour every evening就划线部分提问划线处是half an hour 是half hour还是half an hour? for an hour 用英语怎么说 for an hour.用汉语怎么说 since 还是 for an hour ago you --- (be）late for an hour