2.現在分詞的被動語態(being +過去分詞)通常表示“正在被…”的意思。如強調現在分詞表示的動作發生在謂語動詞所表示的動作之前時，可用現在分詞被動語態的完成式(having + been +過去分詞)。

　　例如:

　　The bridge being built will be completed next month.正在修建的那座橋將于下月完成。

　　Having been kept out of the room about half an hour for his returning late，Tom was let in.湯姆回來晚了，所以被關在門外半小時左右才讓他進去。

　　Now let' s do some exercises:

　　1、用現在分詞或過去分詞結構改寫下列句子:

　　Examples;

　　A student is reading a book over there. He is our monitor.

　　---The student reading a book over there is our monitor.

　　I saw him. He was running for the bus.

　　---I saw him running for the bus.

　　He sat there. He was watching the men at work

　　---He sat there watching the men at work.

　　Tom felt tired. He went to bed at once.

　　---Feeling tired, Tom went to bed at once.

　　I had worked for a long time, so I felt very tired.

　　---Having worked for a long time, I felt very tired.

　　The plan is about middle school education. It is being discussed.

　　---The plan being discussed is about middle school education.

　　1)The teacher is taking a walk on the playground. He is our teacher of English.

　　-----The teacher taking a walk on the play ground is our teacher of English.

　　2)The birds filled the air with music. They were singing in the trees.

　　-----The birds singing in the trees filled the air with music.

　　3) Here is a novel. It was written b Lu Xun.

　　-----Here is a novel written by Lu Xun.

　　4) The language is English. It is spoken in Australia.

　　-----The language spoken in Australia Is English.

　　5) Do you know the number of students? They are coming to the English Evening.

　　-----Do you know the number of students coming to the English Evening?

　　6) I could hear the boys. They were playing in the field.

　　-----I could hear the boys playing in the field.

　　7) He was glad to find the fire. It was burning brightly.

　　-----He was glad to find the fire burning brightly.

　　8) I watched them. They were dancing.

　　-----I watched them dancing.