以ask为例写出8种时态的被动语态。

虽然不懂什么叫以ASK为例！我想我答的应该是对的！！ -。-||！
Tom is asked to clean his room by his mother.
Tom was asked to clean his room by his mother.
Tom is being asked to clean his room by his mother.
Tom was being asked to clean his room by his mother.
Tom has been asked to clean his room by his mother.
Tom had been asked to clean his room by his mother.
Tom will be asked to clean his room by his mother.
Tom is going to be asked to clean his room by his mother.
Tom would be asked to clean his room by his mother.

被动语态的基本形式：主语＋be（跟据时态的改变而改变）+P.P(动词的过去分词）+by+宾语
被动语态就是主语是动作的承受者，主动语态是动作的执行者。
把主动语态变被动就是：
把主动语态的主语变为被动语态的by+宾语。动词变为be+P.P(动词过去分词）。主动语态的宾语变为被动语态的主语！主动语态动词后的直至宾语都照抄下来！

Helen is asked to join the club.
Helen was asked to join the club last week.
Helen is being asked to join the club.
Helen was being asked to join the club when I went in.
Helen has been asked to join the club.
Helen had been asked to