be free

• Is there a time when the conference room is free ?
  会议室有空着的时候吗？
• Membership is free , so join today !
  免交会费，今天就参加吧。
• Within the limitation you are free to do as you choose .
  在这个界限内可任便。
• The discharge from the weir opening should be free .
  从堰开口处的泻水应畅通。
• We were rather hoping you would be free on friday .
  我们很希望你星期五能有空。
• You are free to come and go as you please .
  你来去自便。