a

Ex1: Rewrite the complete sentence using the adverb of frequency in brackets in its correct position.

1. They go to the movies. (often)

\(\Rightarrow\) They often go to the movies.

2. She listens to classical music. (rarely)

\(\Rightarrow\) She rarely listens to classical music.

3. He reads the newspaper. (sometimes)

\(\Rightarrow\) He sometimes reads the newspaper.

4. Sara smiles. (never)

\(\Rightarrow\) Sara never smiles.

5. She complains about her husband. (always)

\(\Rightarrow\) She always complains about her husband.

6. I drink coffee. (sometimes)

\(\Rightarrow\) I sometimes drink coffee.

7. Frank is ill. (often)

\(\Rightarrow\) Frank is often ill.

8. He feels terrible. (usually)

\(\Rightarrow\) He usually feels terrible.

9. I go jogging in the morning. (always)

\(\Rightarrow\) I always go jogging in the morning.

10. She helps her daughter with her homework. (never)

\(\Rightarrow\) She never helps her daughter with her homework.

Ex 2: Sắp xếp các từ sau để tạo thành câu hoàn chỉnh với trạng từ chỉ tần suất:

1. sometimes / watch / They / TV / in the evening.

\(\Rightarrow\) They sometimes watch TV in the evening.

2. always / does / her / homework / She.

\(\Rightarrow\) She always does her homework.

3. rarely / He / to / the park / goes.

\(\Rightarrow\) He rarely goes to the park.

4. never / eat / We / junk food.

\(\Rightarrow\) We never eat junk food.

5. often / He / late / stays / at work.

\(\Rightarrow\) He often stays late at work.

6. usually / I / coffee / in the morning / drink.

\(\Rightarrow\) I usually drink coffee in the morning.

7. play / They / games / on weekends / often.

\(\Rightarrow\) They often play games on weekends. 

8. seldom / She / early / for work / arrives.

\(\Rightarrow\) She seldoom arrives early for work.

9. always / He / his dog / in the park / walks.

\(\Rightarrow\) He always walks his dog in the park.

10. rarely / They / go / to the beach / in winter.

\(\Rightarrow\) They rarely go to the beach in winter

                                       Bài giải:

\(\text{Tổng số con vật trong trang trại là:}\)
\(30+20+30=80\left(con\text{ }vật\right)\\ \dfrac{1}{2}\text{\text{ }\text{ }tổng số con vật trong trang trại là:}\text{ }\\ 80\times\dfrac{1}{2}=40\left(con\text{ }vật\right)\\ \text{Số con bò cần thêm để số con bò bằng \dfrac{1}{2} tổng số con vật là:}\\ 40-20=20\left(con\text{ }bò\right)\)

Đáp số: \(20\text{ }con\text{ }bò\)

\(x⋮4;\text{ }x⋮7;\text{ }x⋮8\Rightarrow x\in BC\left(4;7;8\right)Mà\text{ }x\text{ }nhỏ\text{ }nhất\text{ }\\ \Rightarrow x\text{ }là\text{ }BCNN\left(4;7;8\right)\)

\(Ta\text{ }có:\text{ }4=2^2 \)

            \(7=7\)

            \(8=2^3\)

\(\Rightarrow BCNN\left(4;7;8\right)=56\text{ }hay\text{ }x=56\)

\(Vậy\text{ }x=56\)

\(-12+\dfrac{\left(-3\right)}{x}==4\\ \dfrac{-3}{x}=4-\left(-12\right)\\ \dfrac{-3}{x}=16\\ -3\div x=16\\ x=-3\div16\\ x=-\dfrac{3}{16}\)

I.Chia động từ đúng trong ngoặc ở thì HTĐ

1. Lan (play)____plays______ the piano well.

2. They (watch) _____watch______ TV every night.

3. I (not often go)______do not often go____ to school by bus.    

4. Mai (have) ___has____dinner with her family every evening.

6. __Does____Mr. Nhan (go) ____go___ to work by car ?

7. ____Do____the students usually (write) ____write__ the answers on the blackboard?

8. Mai sometimes (eat) ______eats____ some chicken and some rice at the moment.

9. Phong ( not often have) _does not have_____ meat for his lunch.

10. Does your sister (brush) ___brush_____ her teeth after every meals?   

11. Nam ( not like) ____does not like_____ potatoes and carrots.

12. Hoa sometimes (play) ____plays_____ volleyball with her friends. She(play) ___plays______ it twice a week.

13. What __does___your father (do) __do__after work ?

14. He (be) ___is___ in the garden.

15.  _Does___your son  (often sleep) _often sleep___ late ?

16. He never (drink) ____drinks_____ beer.

\(7,268\text{ }m^2=726,8\text{ }dm^2\)