用括号内所给动词的适当形式填空。
1. I’ll tell our monitor the good news as soon as he ________ (come) back to school.
2. It was a pity that you _________ (not attend) the meeting last Friday afternoon.
3. We should think about what we can do ________ (keep) animals and plants from becoming endangered.
4. On May 12, 2008, sichuan __________ (hit) by a strong earthquake which killed many people and destroyed many buildings.
5. Playing computer games is delightful, but _______ (spend) too much time on it may do harm.
6. Today, to hold the Olympic Games __________ (consider) as a rich prize for a country.
7. Many changes ________ (take) place in our daily life since the invention of the computer.
8. The policeman said that he __________ (see) a Young Pioneer help an old woman cross the road the day before.
9. Our Maths teacher __________ (prepare) the new lesson with other teachers in the office from 2 to 4 yesterday afternoon.
10. The first step towards ________ (protect) the environment is to try to throw away less rubbish.
1. comes 2. didn’t/ did not attend 3. to keep 4. was hit
5. will get 6. is considered 7. have taken 8. had seen
9. was preparing 10. protecting
实意动词使用方法：
及物动词
后面必须跟宾语意义才完整的实义动词，叫做及物动词(transitive verb)。如：
I believe that the committee will consider our suggestion.我相信委员会将会考虑我们的建议。
“How long can I keep the book ?”Harry asked.哈里问：“这本书我可以借多久?”
Dr. Bethune set us a good example. 白求恩大夫给我们树立了好榜样。
Crude oil contains many useful substances.原油含有许多有用的物质。
不及物动词
本身意义完整后面不须跟宾语的实义动词，叫做不及物动词(intransitive verb)。如：
Birds fly.鸟会飞。
It happened in June 1932.这件事发生于一九三二年六月。
My watch stopped.我的表停了。
She spoke at the meeting yesterday evening. 她在昨天晚上的会上发了言。
兼作及物动词和不及物动词
英语里有不少实义动词可以兼作及物动词和不及物动词。这样的动词又有两种不同的情况
a)兼作及物动词和不及物动词时，意义不变。试比较：
Shall I begin at once?我可以立刻开始吗?(begin作不及物动词)
She began working as a librarian after she left school.她毕业后当图书馆管理员。(began作及物动词)
When did they leave Chicago?他们是什么时候离开芝加哥的？(leave 作及物动词)
They left last week. 他们是上周离开的。(left 作不及物动词)
b)兼作及物动词和不及物动词时，有时意义不尽相同。如：
Wash your hands before meals.饭前要洗手。
Does this cloth wash well? 这布经得起洗吗?
实意动词的用法：
肯定句：
主语+动词过去式+其它
否定句：
主语+助动词didn‘t+动词原型+其他
一般过去式：
Did+主语+动词原型+其他
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