VI.  Make conditional sentences:

1. Keep silent or you’ll wake the baby up.

→ If you don't keep silent, you will wake the baby up.

2. Stop talking or you won’t understand the lesson.

3. I don’t know her number, so I don’t ring her up.

4. I don’t know the answer, so I can’t tell you.

5. We got lost because we didn’t have a map.

6. Susan felt sick because she ate four cream cakes.

8. He lost his job because he was late every day.

9. Peter is fat because he eats so many chips.

10. Robert got a bad cough because he started smoking cigarettes.

VII. Rewrite the following sentences:

1. He can’t go out because he has to study for his exam.=> If…………………..……………………..

2. She is lazy so she can’t pass the exam.=>If…………………………………………………………

3. He will pay me tonight; I will have enough money to buy a car.=> If……………………………….

4. He smokes too much; that’s why he can’t get rid of his cough.=> If…………………………………..

5. She is very shy, so she doesn’t enjoy the party.=> If……………………………………………..

6. I will get a work permit. I will stay for another month.=> If…………………………………………..

7. He doesn’t take any exercises. He is so unhealthy=> If………………..………………………….

8. We can’t get the ticket because I don’t have the right change.=> If…………………………….

9. Study hard or you won’t pass the exam.=> If…………………………………………………..

10. Don’t be impatient or you will make mistakes.=> If……………………………………………..

11. I didn’t eat lunch, I feel hungry now.=> If I…………..………………………………….

12. I only come if they invite me.=> unless……………………………………………….

13. He didn’t revise all his lessons, he failed the exam.=> If he………………………………………..

14. The park is over there, only 5 minutes’ walk.=> If you walk…………………………………….

15. Leave me alone or I’ll call the police.=>Unless………………………………………….………

16. If you arrive at the office earlier than I do, please turn on the air-conditioner.=> Should………….

17. The children don’t go to school in the snowy weather.=> If it ……………………………………

18. He died so young; otherwise, he would be a famous musician by now.=>Had …………………..

19. You must tell me the whole truth or I won’t help you.=> Unless……………………………………

20. The car breaks down so often because you don’t take good care of it.=> Were I……………………

21. He is very bad-tempered, that’s why his wife left him soon after marriage.=> If he…………………

22. Don’t tell lies to your boss or you’ll be fired at once.=> If……………………………………………

V. Complete each of the following sentences so that it means the same as the sentence before

1. She doesn’t live in London because she doesn’t know anyone there→ She’d ……………………

2. I can’t live in the country because I can’t find a job there→ I’d ………………………………….

3. I don’t have a spare ticket. I can’t take you to the concert→ If I …………………………………

4. The schoolchildren sowed some seeds, but they forgot to water them so they didn’t grow.→ If ……..

5. They don’t understand the problem. They won’t find a solution→ If they ………………………………

6. He sits around too much. He isn’t fit.→ If he …………………………………………………………

7. Carol didn’t answer the phone because she was studying..→ If Carol …………………………………

8. Rita is exhausted today because she didn’t get any sleep last night.→ If Rita ……………………….

9. She’s very thin; perhaps that’s why she feels cold so much.→ If she ……………………………….

10. He never polishes his shoes, so he never looks smart→ If he …………………………………….

11. He can’t park near his office; that’s why he doesn’t come by car→ If he ………………………………

12. My house is guarded by two big dogs. That’s the only reason it isn’t broken into every night→ If my..

13. The flats are not clearly numbered, so it is very difficult to find anyone.→ If the flats …..………..

14. I don’t know her e-mail address, so I can’t tell you→ If I ……………………………….……….

15. She works in the evening. She has no time to play with her children→ If she ………………………

16. I don’t want them to be upset, so I’ve decided not to tell them what happened.→ They ……………

17. I am not tall enough to join the basketball tea→ If I ………………………………………………

18. He doesn’t see the signal so he doesn’t stop his car→ If he ………………………………………….

19. Peter gets bad marks because he doesn’t prepare his lessons well→ If Peter ………………………

20. Mary doesn’t have enough money. She can’t buy a new car.→ If Mary ……………………………

21. Go right now or you’ll be late for the train.→ If you………………………………………….

22. He doesn’t apply for the job because he doesn’t have enough qualifications.→ If he ……………….

23. Hurry up, or we will be late for the exam.→ If we …………………………………………………

24. They do not understand you because you do not often talk to them.→ If you …………………………

25. Because you speak English unnaturally, they do not understand you.→ If you ………………………

MN giúp em với ạ

3x³-24 giúp mik với ạ

Hòa tan 4 gam  canxi bằng 2,4.10^23 phân tử nước thu được dd X và V lít khí H2 thoát ra ở đktc

a)Tính khối lượng chất dư sau phản ứng 

b)Tính V khí H2 thoát ra ở đktc

c) Tính khối lượng chất tan trong dd X 

mọi người giúp em với ạ

Một người cần đưa vật nặng có trọng lượng 500N lên tầng cao 4m

a)    Tính công của người đó khi kéo vật lên phương thẳng đứng

b)    Nếu người đó sử dụng mặt phảng nghiêng để kéo vật nặng lên thì cần dung 1 lực kéo là 250N.Vậy chiều dài mặt phẳng nghiêng là bao nhiêu (bỏ qua ma sát hoặc phẳng nghiêng)

c)    Trên thực tế do có ma sát nên lực kéo trên mặt phẳng nghiêng là 320N.Tính hiệu suất

Một con ngựa kéo xe đi được 150m với lực kéo là 300N trong thời gian kéo là 90s 

a) Tính công của con ngựa đã thực hiện

b)Tính công suất làm việc của con ngựa

Mọi người giúp mình với ạ mình đang vội

2X x(3X^2-5X+3) mọi người giải giúp em với ạ

Cho tam giác nhọn ABC (AB<AC),đường cao Ah.Gọi M là trung điểm của AB,D là điểm đối xứng với H qua M.

a)Chứng mính tứ giác AHBD là hình chữ nhật 

b)Biết AB=10cm,BH= 6cm.Tính diện tích hình chữ nhật AHBD

c)Gọi I,N lần lượt là trung điểm của BC và AC.Chứng minh IHMN là hình thang cân

nhờ mọi người giảo hộ mình câu này với ạ

cho tam giác ABC cân tại A.Đường cao AH.Đường thẳng qua C song song với AH cắt đường thẳng qua A song song với HC tại E

a.Chứng minh tứ giác AECH là hình chữ nhật.

b.Chứng minh EH=AB

c.Gọi giao của AC và EH là O.Qua O kẻ đường thẳng song song với HC cắt AH tại K.So sánh diện tíc tam giác AKO và diện tích tam giác AHC

mọi người giúp mình vói ạ