現在進行時的主動形式是am/is/are doing。表達正在…，其被動形式比較特別，是am/is/are being done。表示正在被…。例如They are painting the wall。他們正在粉刷牆壁。
又如，Will you lend mr your bike? Mine is being repaired niw。
你能把自行車借給我嗎
我的正在修呢。
He is listening to music in the room.
The new bridge is now being built.
