Present perfect continious сделайте 5 вопросов и ответы пожалуйста

  1. How long have you been making a cake?  I have been making a cake for two hours already. 2. How long has yourfriend been drinking coffee? - Your friend has been drinking coffee for 20 minutes .   3. Have students been reading this text for thirty minutes? - Students have been reading this text for thirty minutes.   4. What has she been singing  the whole evening? -  She has been singing songs the whole evening.   5. Has John been preparing dinner since 3 o'clock? - John has been preparing dinner since 3 o'clock.