承受者+be（is/am/are）being（现在分词）done by+执行者（不明确可省略）。

　　E.g. 主动：He is writing his composition.

　　被动：His composition is being written by him.

　　Note：write/wrote/wtitten

　　过去进行时的被动语态：

　　承受者+be （was/were）being（现在分词）done by+执行者（不明确可省略）。

　　E.g. 主动：He was majoring computer during his college.

　　被动：Computer was being majored by him during his college.

　　将来时的被动语态：

　　承受者+be going to/will/shall（be动词原形）/be to be done by+执行者（不明确时可省略）。

　　E.g.1 A big supermarket will/shall/be to be built here next year

　　Note ：be to ：计划或安排好的动作或行为。

　　E.g.2 The flight is to leave for Hefei city.