1. she has lived in Danang since she was a kid

2. I haven't visited my grandparents for 5 years

3. How long have you loved him?

4. I haven't go to the bar for 6 years.

5. She hasn't written to me for years.

Who - Whom - Whose 

Combine the sentences 

1. There are 3 nurses here. They are trying to save the patients. 

There are 3 nurses who are trying to save the patients here. 

2. The students are really nerves - racking. The teachers are going to hand out their test's result. 

The students who were going to hand out their test's result by teachers are really nerves - racking.

3. The manager of the company was such an intellectual man. His professional manner makes me admire. 

The manager of the company was such an intellectual man whose professional manner makes me admire. 

4. I can't understand why you always look up to that neighbor. He just a normal man. 

I can't understand why you always look up to that neighbor who just a normal man. 

5. The English teacher is going to go aboard. I need to say goodbye to him. 

The English teacher to whom I need to say goodbye is going to go aboard.

6. The toodles are being punished. They stole the biscuits on the fridge. 

The toodles who stole the biscuits on the fridge are being punished.

7. We were texting the owner of that shop. I had bought 3 items from him. 

We who had bought 3 items from him were texting the owner of that shop.  

8. The books are torn apart. Its content is quite good. 

The books whose content is quite good are torn apart.

9. The movie director was so busy. He had to take charge of a lot of responsibilities. 

The movie director who had to take charge of a lot of responsibilities was so busy. 

10. The refugees try to go to the other countries. Their homes are lost.

 The refugees whose homes are lost try to go to the other countries.

11. I do not know that singer. I saw her on television last night.

I do not know that singer whom I saw on television last night.

13. The neighbors are cutting plants. Their flowers give off such good smell.

 The neighbors whose flowers give off such good smell are cutting plants.

14. They are filming the tiger. I have never seen it before.

They are filming the tiger which I have never seen before.

15. The writer is so prolific. She has written 3 books this year.

The writer who has written 3 books this year is so prolific.

lỗi

lx r

lỗi

1. ……………………Does the film begin………..…………………………….. (the film/ begin) at 7.00 or 8.00?

2. The art exhibition (open) ………opens……………… on 5 May and (end) ………ends…………… on 4 July.

3. The train (leave) …………leaves………… Saigon at 2.30 and (arrive) …………arrives……. in Nha Trang at 8.00.

4. We (start) ………start……………. our work on Tuesday and (finish) ………………finish………. on Sunday.

5. Next Saturday (be) ……………is……………….. thirteenth.

6. When …………………does this TV program finish…………..…………………………….. (this TV program/ finish)?

7. Where ………………do they collect…………..…………………………….. (they/ collect) garbage?

8. My train ………………leaves…………….. (leave) at 8.00, so I need to be at the station by 7.45.

9. What time …………………………does she finish…..…………………………….. (she/ finish) your work tonight?

10. “What time ………………does your train leave……………..…………………………….. (your train/ leave) tomorrow?”

– “Seven o’clock in the morning. It (get) ………gets……………………..into Paris at eleven.”

Children ought to play outdoors to develop their socail skill

Combine 2 sentences using Relative Pronouns:

1. There are a lot of interesting places. I'd like to visit them.

=> There are a lot of interesting places where I'd like to visit

2. I'm looking forward to the programme. It's on after the news.

=> I'm looking forward to the programme which is on after the news

3. Do you remember the hotel in Edinburgh? Your parents stayed there last year.

=> Do you remember the hotel in Edinburgh where Your parents stayed last year?

4. Those are shose. I cleaned them for you.

=> Those are shose which i cleaned for you

5. That's the old lady. Her brother won the Nobel Prize.

=> That's the old lady whose brother won the Nobel prize

6. I've lost the list. I had it in my hand a moment ago.

=> I've lost the list which i had in my hand a moment ago

7. Andrea went to see the dentist. He took out two of hos teeth.

=> Andrea went to see the dentist who took out two of hos teeth

8. Have you seen the film? It's on at the Odeon.

=> Have you seen the film which is on at the odeon?

9. Edward has just moved to France. His mother died last year.

=> Edward whose mother dided last year, has just moved to France 

10. Lydia is reading that fascinating book on Spanish history. You lent it to her last week.

=> Lydia is reading that fascinating book on Spanish history which you lent to her last week

11. He cheated on me. That makes me cry so much.

=> He cheated on me why makes me cry so much

12. Mary has got the highest score in my class. That makes me surprise.

=> Mary has got the highest score in my class why makes me surprise

13. Trung's grandfather passed away. That makes him sad.

=> Trung's grandfather passed away why makes him sad

14. My test score was terrible. That makes me really disappointed.

=> My test score was terrible why makes me really disappointed

15. Tram always stay beside me when i have troubles. That makes me touched.

=> Tram always stay beside me when i have troubles why makes me touched

16. My mother baked me a cake for my birthday party. That makes me happy.

=> My mother baked me a cake for my birthday party why makes me happy

17. My brother forgot my shoes size. That makes me so frustrated.

=> My brother forgot my shoes size why makes me so frustrated

18. He did everything he could to help me. That touches me.

=> He did everything he could to help me why touches me

19. She is crying a lot. That makes me confused.

=> She is crying a lot why makes me confused

20. Tom invited me to have dinner with him in a restaurant. That makes me happy

=> Tom invited me to have dinner with him in a restaurant why makes me happy

\(a^3b-ab^3=ab\left(a^2-b^2\right)=ab\left(a^2-ab+ab-b^2\right)=ab\left(a-b\right)\left(a+b\right)\)

Với a hoặc b chẵn \(\Leftrightarrow ab\left(a-b\right)\left(a+b\right)⋮2\)

Với a và b lẻ \(\Leftrightarrow\left(a-b\right)⋮2\Leftrightarrow ab\left(a-b\right)\left(a+b\right)⋮2\)

Vậy \(ab\left(a-b\right)\left(a+b\right)⋮2,\forall a,b\left(1\right)\)

Với a hoặc b chia hết cho 3 thì \(ab\left(a-b\right)\left(a+b\right)⋮3\)

Với \(a=3k+1;b=3q+1\Leftrightarrow\left(a-b\right)=3\left(k-q\right)⋮3\)

\(\Leftrightarrow ab\left(a-b\right)\left(a+b\right)⋮3\)

Với \(a=3k+1;b=3q+2\Leftrightarrow\left(a+b\right)=\left(3k+1+3q+2\right)=3\left(k+q+1\right)⋮3\)

\(\Leftrightarrow ab\left(a-b\right)\left(a+b\right)⋮3\)

Mà a,b có vai trò tương đương nên \(ab\left(a-b\right)\left(a+b\right)⋮3,\forall a,b\left(2\right)\)

\(\left(1\right)\left(2\right)\Leftrightarrowđpcm\)

Ta có : a³b -ab³ 
=a³b -ab -ab³ +ab
=ab (a² -1) -ab (b² -1) 
=ab (a-1)(a+1) -ab (b-1)(b+1)
Vì a (a-1)(a+1) là 3 số tự nhiên liên tiếp nên chia hết cho 6 .Tương tự b (b-1)(b+1) cũng chia hết cho 6
=> a³b -ab³ chia hết cho 6 (đpcm )
 

Refer

Of all the sports I know, I like football most. The reason why I like it is the clever cooperation among players. When I was a child, my father taught me to play soccer by letting me kick a ball into the goal. At the present, I usually play football with my friends at weekends. Sometimes I play football with my brother after leaving school to take it easy. It is the fact that playing soccer is a way of exercising and relaxing efficiently. Not only do I like to play it but I also enjoy watching football shows and football matches. I am really addicted to it. Moreover, I am a fan of Manchester United. To sum up, soccer is the most interesting sport I extremely love.

I used to play a lot of sports, but I still enjoy playing basketball the most. I often play basketball with the boys in my class and if I have free time, I will participate in competitions organized by the school. I started playing basketball 4 years ago and I started liking it when I was in 4th grade. Thanks to it, my class won a silver medal in women's basketball.

11. My sister walks to school.
12. The bank is near the post office.
13. Our garden has many flowers.
14. Ba doesn't live outside the city.
15. Nma doesn't live in the countryside.

11 My sister walks to school

12 The bank is near the post office

13 Our garden has many flowers

14 Ba doesn't live in the countryside

15 Nam doesn't live in the countryside