承受者+be（is/am/are）being（現在分詞）done by+執行者（不明確可省略）。

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

　　被動：His composition is being written by him.

　　Note：write/wrote/wtitten

　　過去進行時的被動語態：

　　承受者+be （was/were）being（現在分詞）done by+執行者（不明確可省略）。

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

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

　　將來時的被動語態：

　　承受者+be going to/will/shall（be動詞原形）/be to be done by+執行者（不明確時可省略）。

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

　　Note ：be to ：計劃或安排好的動作或行為。

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