4. 1. The government had better ______ (take) action _________(prevent) air pollution. 2. Binoculars can help you see ________(clear). 3. It takes hours __________ (watch) the birds. take to prevent clearly to watch 用所给单词的适当形式填空。

5. 4. Take a pair of sunglasses with you __________(protect) your eyes. 5. The gym is about 500 square metres in _______(area). to protect area

6. 1. Many ________(visit) come to Yancheng Nature Reserve to go birdwatching every year. 2. There are ________(speak) in each corner of the hall. 3. Yi Jianlian is my favourite basketball ________(play). 4. Einstein was one of the greatest ________(science) in history. visitors speakers player scientists

7. We can add -er, -or and -ist to some words (n./v.) to form nouns for people. Verb/Noun+ Suffix Noun speak+ er speaker visit+ or visitor tour+ ist tourist

8. Sometimes we need to change the ending of the verb/ noun when we add the suffix. dance dancer win winner piano pianist science scientist

9. 表示人的身份、职业、国籍等的后缀 -er farmer speaker reporter dancer -or editor actor director sailor -ist artist scientist -an musician politician Asian Indian -ese Chinese

10. Change the following words into nouns for people by adding the correct suffixes. 1 act ___________ 6 play_____________ 2 art __________ 7 report____________ 3 drive __________ 8 science____________ 4 farm __________ 9 work______________ 5 paint __________ 10 write____________ actor player artist reporter driverscientist farmer worker painter writer A

11. Complete the following sentences with the correct nouns of the words in brackets. Use the plural form if necessary. B

12. Birds are ________(sing). They can make beautiful sounds. Some _______(act) can make different bird sounds. It is very interesting. A lot of _________(tour) go to the wetlands to watch birds every year. There are many _______ (visit) at bird shows too. Some ________ (art) like to paint birds. singers actors tourists visitors artists

13. The birds in their pictures are really beautiful. Some _______ (write) like to include birds in their poems too. Birds are part of out lives. They are our friends. writers

14. 1. make beautiful sounds 发出优美的声音 2. at bird shows 在鸟展上 3. birds in the pictures 画里的鸟 4. include birds in their poems 把鸟写进他们的诗里 5. part of our lives 我们生活的一部分

15. 写出下列单词的名词形式。 sing ___________ farm _________ invent ___________ climb_________ village _________ wait ____________ cut___________ stop__________ piano_________ train_________ singer farmer inventor climber villagerwaiter/waitress cutterstopper pianist trainer

16. Revise how to form nouns for people by adding -er, -or and -ist.