1. 现在进行时：由"am/is/are + being + 过去分词"构成，如：
　　The problem is being dismissed by those students.
　　The car is being cleaned by Albert.

2. 过去进行时：由"was/were + being + 过去分词"构成，如：
　　The corn was being harvested early this year.
　　The experiment was being made when the lights were off.
　　I suspected that we were being followed so I turned round to have a look from time to time.

3. 被动语态没有将来进行时态，必要时可用一般时态，如：
　　We shall be discussing it tomorrow.
　　It will be discussed tomorrow.