How long do they stay in Beijing?

How long do they stay in Beijing? How long can they live? How long do dolphins sleep? 填空：How long do they ______doing the work?The work ____them 20 hours. she asked me:“how long do they stay?”怎么改为间接引语 how long did you stay here how often do his parents let him watch TV?where do they come from 这些句子中的do 是什么用法? known,how long,have they,each other how long have they 还是用them how long have they 还是用them they about how do they get to school and how long does it take.这句话有什么问题?（所有的问题） How do they go there? how do they go there? 翻译：1 i'm just looking,thanks.2 how do you like the pants?3 they're too long. No one was sure how long the snow _______ (last) at that moment. All they could do was to wait. how long do you exercise every how long do you go to school how long do you read every night? how long do you love me