Read Part 1 of the article. What happened to the spaceship? Rewrite the underlined participle or infinitive clauses as relative clauses.

... which was launched from Florida on 11 April 1970.

PART 1

Apollo 13, launched from Florida on 11 April 1970, was the third Apollo mission to land on the moon. The three astronauts chosen for the mission were James Lovell, Fred Haise and John Swigert. The launch, watched by millions on TV, went smoothly and for the first two days in space, everything went well. The

crew gave a 49-minute TV interview explaining how they lived and worked in zero gravity. However, nine minutes after the interview finished, a tank containing oxygen exploded and John Swigert, noticing a red warning light, said the famous words: 'Houston, we've had a problem here. They checked all their equipment and realised that they were running out of water, power and oxygen-hard and fast. They were in a damaged spaceship floating 320,000 kilometres from Earth.

Read part 2 of the article. Why is Apollo 13 mission described as a 'successful failure'? Rewrite the underlined clauses in part 2 as participle clauses.

1 ... fitted with its own oxygen tank...

PART 2

The astronauts left the main part of the spaceship and went inside the lunar module, ¹which had been fitted with its own oxygen tank. But inside the smaller module, ²which was designed to hold only two people, carbon dioxide levels started rising. The astronauts, ³ who had been following instructions from the ground crew, made special filters out of plastic bags and cardboard. Then they waited in the cold and dark while the ground crew, ⁴ who were working 24 hours a day, tried to work out a way to bring them home. If some people in America were losing interest in the Space Program, the Apollo 13 crisis, ⁵ which was discussed on all the TV news programmes, changed all that. The astronauts ⁶ who were risking their lives and the people ⁷ who were trying to save them all became national heroes - especially when Apollo 13 returned safely to Earth with all three astronauts alive.

Combine the sentences, using when, where or which. (cẩn thận những câu là "Non-defining relative clauses" thì nhớ phải thêm dấu phẩy):

12. I would like to live in a country. There is plenty of sunshine in the country.

-> ........

13. I haven't seen them since the year. They got married in that year.

-> ......

 Rewrite the pairs of sentences as one sentence using a defining or non-defining relative clause. 

1 I work for a man. The man’s farm covers thousands of acres.

I work ……………………………………………………………………………………………………………………

2. The spacecraft is called Vostok 3KA. It took Yuri Gagarin into space.

The spacecraft ……………………………………………………………………………………………………………

3. She likes her father’s career. Her father pursued this career all his life.

She likes …………………………………………………………………………………………………………………

4. He admires the teacher. That teacher initiated building the school library.

He admires ………………………………………………………………………………………………………………

5. My grandfather used to be an astronaut. He has been retired for ten years now.

My grandfather……………………………………………………………………………………………………………

6. Students will have to make their own learning decisions. This will be hard for many of them.
Students …………………………………………………………………………………………………………………

7. Look at the highlighted examples of non-defining relative clauses in the text. Circle the correct words below. 

(Nhìn vào các ví dụ được tô sáng về mệnh đề quan hệ không xác định trong văn bản. Khoanh tròn các từ đúng dưới đây.)

LEARN THIS! Non-defining relative clauses

a. In non-defining relative clauses, we use who, which, where and whose, but we do not use that.

b. A non-defining relative clause: 

comes immediately (1) before / after a noun and gives us information about that noun.

adds extra information to the sentence; the sentence (2) makes sense / does not make sense without it.

(3) has / doesn't have a comma at the start. It has a comma or a full stop at the end.

3. Read the Learn this! box. Can you find examples of all three rules in the article in exercise 1?

(Đọc Learn this! Bạn có thể tìm ví dụ về cả ba quy tắc trong bài viết ở bài tập 1 không?)

LEARN THIS! Defining relative clauses

a. A defining relative clause tells us which person we are talking about.

(Một mệnh đề quan hệ xác định cho ta biết người mà chúng ta đang nói đến.)

He’s the police officer who arrested the man. The police officer who arrested the man is over there.

(Anh ta là sĩ quan cảnh sát đã bắt người đàn ông. Sĩ quan cảnh sát đã bắt người đàn ông đang ở đằng kia.)

b. In informal style, we often use that instead of who and which.

(Trong văn phong không trang trọng, chúng ta dùng that thay vì who và which.)

The boy that you saw is my brother.

(Cậu bé mà cậu thấy là em trai mình.)

c. In formal style, we can use whom instead of who when the pronoun is the object of the clause or follows a preposition.

(Trong văn phong trang trọng, chúng ta sử dụng whom thay vì who khi đại từ là tân ngữ của mệnh đề hoặc theo đó là một trạng từ.)

The nurse whom the police questioned has moved abroad. Is this the man to whom you are referring? (Tên y tá bị cảnh sát tra hỏi đã ra nước ngoài. Đây có phải là người đàn ông anh đang nhắc đến không?)

1. Decide whether the following Clauses are defining or non- defining clauses , Insert commas where necessary

1). The car which was a race sports coupe was built in 1996.( Defining / Non - defining)

2. We invited thể boy who Tom had met the week before the party ( defining / non defining)

3. Our friends who we met at university are coming to visit next week( defini g /.non defining)

4. Thật is the building where they shot thể film " Vanilla Sky".( Defining / non defining)

5. Mr Jackson whose sơn also goes to this school will be attending the party next weekend.( Defining/non defining)

Identify the relative clauses in these sentences. (Some contain more than one.) Rewrite them as participle or infinitive clauses.

1 The word astronaut, which is formed from two Greek words, means 'star sailor'.

2 Only flights which reach an altitude of 100 km or more are considered space flights.

3 NASA astronauts are given a difficult training programme which they have to complete after twenty months.

4 Astronauts who spend long periods in space do exercises which have been designed to keep them strong.

5 Spacecraft which intend to escape from Earth's gravity need to reach a speed of about 40,000 km/h.

6 The film Apollo 13, which was made in 1995, is a very interesting film on space travel that should be seen.

b. Combine the sentences using non-defining relative clauses.

(Kết hợp các câu sử dụng mệnh đề quan hệ không xác định.)

1. George Beauchamp was an American inventor. He invented the electric guitar in 1932.

(George Beauchamp là một nhà phát minh người Mỹ. Ông đã phát minh ra guitar điện vào năm 1932.)

→ George Beauchamp, who was an American inventor, invented the electric guitar in 1932.

(George Beauchamp, một nhà phát minh người Mỹ, đã phát minh ra đàn guitar điện vào năm 1932.)

2. Philo T. Farnsworth was the first television's inventor. He invented it in 1927.

(Philo T. Farnsworth là người phát minh ra tivi đầu tiên. Ông đã phát minh ra nó vào năm 1927.)

3. Tom Kilburn developed the first software in 1948. He worked for the University of Manchester.

(Tom Kilburn đã phát triển phần mềm đầu tiên vào năm 1948. Ông làm việc cho Đại học Manchester.)

4. Edward Jenner created the first vaccine in 1796. He was a country doctor in England.

(Edward Jenner đã tạo ra vắc-xin đầu tiên vào năm 1796. Ông là một bác sĩ nông thôn ở Anh.)