A piece of evidence
Exposure of the body to strong sunlight maybe harmful.
A good command of English is greatly due to much exposure to that language.
point to
point at
point out
I will have finished the whole book by the end of this term.
We got up early to arrive at the school on time.
I came in the room only to find no body there.
被動語態(tài)：句子的主語是謂語動作的接受者。
例句：
1. Lei Feng is respected by us all.
2. The glass was broken yesterday.
3. I’ve been given some advice.
4. Tom will be sent to college.
5. The work had been finished by then.
6. I was told that he would be given some money.
主動語態(tài)：句子的主語是謂語動作的發(fā)出者。
例句：
1. He goes to school by bus.
2. Li Hong is doing her homework now.
3. She’s giving me some advice.
4. My mother took me to a hospital.
5. They’ll come back soon.
6. By the end of last term we had learned 500 words.
7. He said he would come here the next week.
被動語態(tài)常用的時態(tài)有：
1. 一般現(xiàn)在時：Garage-sale items usually are priced at a very small part of their original cost.
2. 一般將來時：The young driver will be stopped by the policeman if he drives that way.
3. 一般過去時：Not a word was heard from him since he left home.
4. 現(xiàn)在完成時：This dish has been prepared by the chief cook.
5. 將來完成時：The whole book will have been finished by the end of this term.
6. 過去完成時：He told me that the tree in front of our building had been stricken by lightning.
7. 現(xiàn)在進行時：This novel is being retranslated.
8. 過去進行時：A new stadium was being built when we got there last year.
被動語態(tài)沒有將來進行時和三種完成進行時，因為be, being, been這三個詞任何兩個都不能同時使用。
特殊的被動語態(tài)結(jié)構(gòu)：
l 情態(tài)動詞+do→情態(tài)動詞+be done
Eg:
1. The work must be finished today.
2. She should be praised for her work.
3. Everything that can be done must be done.
l Have to do→have to be done
Eg:
1. Mary’s mother had to be operated on.
2. The meeting has to be put off.
l Use to→used to be done
Eg: The plan used to be forgotten.
Be going to = be going to be done
1. The plan is going to be carried out.
2. The project is going to be completed next month.
l 要求雙賓語的動詞的間接賓語常作被動結(jié)構(gòu)中的主語，而直接賓語作保留賓語；當直接賓語作主語時，原間接賓語作為保留賓語常放在介詞to之后（但make, buy的要使用for）。
Eg:
1. We are offered a good job.
2. A good job is offered to us.
3. Lots of money was given to him.
4. A library with 5000 books is offered to the nation as a gift.
5. A new book was bought for me.
6. A pair of shoes was made for him.
