Are you free tomorrow为什么不加this

Are you free tomorrow为什么不加this -Are you free tomorrow?-_______________. Are you free tomorrow是什么意思 Are you free this afternoon Are you free this Saturday? Are you free tomorrow ------ （晚上“） . Are you free tomorrow?否定回答 Are you free tomorrow?(改为同义句) Are you free tomorrow?改写同义句 Are you free on that day为什么要加on? -Are you free tomorrow -Tomorrow?Sorry ,I have no t_______. Are you free tomorrow 同义句 Do you ____any_____tomorrow