1. People say that that plane crashed into the mountains.

-> That plane is said to have crashed into the mountains.

2. She tries to learn English well so as to communicate with foreigners.

-> She tries to learn English well with a view to communicating with foreigners.

3. I started teaching English three years ago.

-> I have taught/ have been teaching English for three years.

4. No one in my class is more intelligent than Lan.

-> Lan is the most intelligent (student) in my class.

5.This exercise was very difficult. We couldn’t do it.

-> This exercise was so difficult that we couldn’t do it.

6. But for your help, I couldn’t have passed the exam.

-> Had you not helped me, I couldn’t have passed the exam.

7. “When will you come back, Nga?”

-> I asked Nga when she would come back.

8. No one has bought this house.

-> This house hasn’t been bought.

9. She didn't take an umbrella so she got wet.

-> She wouldn't have got wet if she had taken an umbrella.

10. It was a mistake for him to buy that house.

-> He shouldn’t have bought that house.

Viết lại các câu sau sao cho nghĩa không thay đổi:

1. The last time I went to Ho Chi Minh City was ten years ago.

-> It is/has been ten years since I last went to Ho Chi Minh city.

2. Although he was very tired, he tried to help me with my homework.

-> Tired as he was, he tried to help me with my homework.

3. The car is too expensive. I can’t afford it.

-> It was such an expensive car that I couldn’t afford it.

4. It's the first time I've been to New York.

-> I haven’t been to New York before.

5. “ You damaged my camera", said Hung to his sister.

-> Hung accused her sister of damaging his camera.

6. We didn't have any holidays until this summer.

-> It was not until this summer that we had some holidays.

7. If you hadn’t studied hard, you would have failed the exam.

-> Had you not studied hard, you would have failed the exam.

8. Lan is pretty but Mai is prettier.

-> Mai is the prettier of the two girls.

9. This is the best film I’ve ever seen.

-> I’ve never seen a better film than this film.

10. My school has over 800 students.

-> There are over 800 students in my school.

a) 5x^2 + 5xy - x - y 

=5x.(x+y)-(x+y)

=(x+y)(5x-1)

b) 7x - 6x^2 - 2

=-6x²+3x+4x-2

=-3x.(2x-1)+2.(2x-1)

=(2x-1)(2-3x)

Truyện ngắn là một thể loại văn học. Nó thường là các câu truyện kể bằng văn xuôi và có xu hướng ngắn gọn, súc tích và hàm nghĩa hơn các câu truyện dài như tiểu thuyết. Thông thường truyện ngắn có độ dài chỉ từ vài dòng đến vài chục trang, trong khi đó tiểu thuyết rất khó dừng lại ở con số đó. Vì thế, tình huống truyện luôn là vấn đề quan trọng bậc nhất của nghệ thuật truyện ngắn.

Truyện ngắn thường chỉ tập trung vào một tình huống, một chủ đề nhất định. Truyện ngắn thường hết sức hạn chế về nhân vật, thời gian và không gian trong truyện ngắn cũng không trải dài như tiểu thuyết. Đôi khi truyện ngắn chỉ là một khoảng khắc của cuộc sống.

Ví dụ một truyện ngắn kể về Nhà chứa Tellier của Maupassant thời gian chỉ 24 giờ, Lời phán quyết của Kafka chỉ xảy ra trong vài tiếng....