Nam and Phong are best friend, but Minh is Phong neighbour. One day, three of them were in the garden that was very near to their house. Minh is a very shy and clever guy, so he was reading his book and sat on the grass while Nam and Phong were playing basketball. Both of them were a very successful . After a will, Phong threw the ball to Minh and invited him to join both of them. After Minh made up his mind, he joined them immediately. They taught him how to play basketball. And soon, they became best friends, and often plays basketball together.

`(15-x)+(x-12)=7-(-5+x)`

`=>15-x+x-12=7+5-x`

`=>3=12-x`

`=>x=12-3`

`=>x=9`

Vậy `x=9`

(15-x)+(x-12) = 7-(-5+x)

<=>15-x+x-12=7+5-x

<=>3=12-x

<=>x=12-3=9

(15-x)+(x-12) = 7-(-5+x)

<=> 15-x +x -12 = 7 +5 -x 

<=> x = 12 +12 -15

<=> x =9

25.I (eat) _______ate_______________a sandwich last night

26.Look! The boys (come) ____________are coming____________________home.

27.Every day his grandfather (go) ________goes___________________for a walk.

28.The Internet (not exitst)_______________did not exist______ 50 years ago

29.I (chat)___________am chatting______________ with my friend at the moment

30.Cats (eat) ______________eat________mice.

31. I think he (be)_____will be______________ the next President of the United States.

32.They (phone) _________phoned___________me two days ago

33.Carol (not like) _____does not like___________________peas.

34.John (play)_______is playing________________ football at the moment.

35.We often (write) _____________write__________________ tests at our school.

36.I (play)__________played_________ volleyball yesterday

37.I think my brother (like)___________will like__________________ this CD

38.He (carry)_________carried____________ the suitcase for me. It was so heavy.

39.I (talk)_______am talking________________ to my teacher now

40.At the moment, Susie (play)_______is playing ____________________ computer games

41.Look! Mandy and Susan (watch)________are watching________________ a film on TV

42.Olivia (visit)__________visits________ her uncle every weekend.

43.Now the sun (shine)____________is shining___________

44.I promise I (be)____________will be__________ there at 5 o’clock

45.There (be)____________were_______ 50 people at tha party last Friday

46.They sometimes (read)____________read_______ poems in the lessons.

47.Tom (miss)________________missed______ the train last night

48.Listen! The band (test)_______is testing_______________ the new guitar.

49. First I (wash)________wash_________ , then I dress.

50.Every morning my mother (get)____________gets________ up at 6 o'clock

Bài này giúp em ôn tập về cách sử dụng một số thì cơ bản:

- Hiện tại đơn: diễn tả hoạt động diễn ra thường xuyên, hàng ngày hoặc thói quen.

- Hiện tại tiếp diễn: diễn tả hoạt động đang diễn ra, dùng với các động từ như: "Look!" (Nhìn kìa!), Watch, Listen! (Nghe kìa)

- Qúa khứ đơn: diễn tả điều đã xảy ra và kết thúc trong quá khứ.

- Tương lai đơn: diễn tả điều sẽ xảy ra trong tương lai, có thể dùng diễn đạt dự đoán. (I think he will like it: Mình nghĩ cậu ta sẽ thích nó)

Em hãy lưu ý những kiến thức cơ bản này và xem phần bài tập làm để nắm kiến thức nhé!

6 Write for or since

1 ....since.................2002

2 ...............since................yesterday

3 ..............for..................six days

4.................for.................a month

5 .................for................two weeks

6 ...................since.................last month

7.................for......................two year

8 ...................for....................a whole day

9......................for...................three hours

10........................since.............Monday

11 ...................since.....................my biethday

12 .......................since.................last weekend

6 Write for or since

1 ....since.................2002

2 ......SINCE......yesterday

3 ........FOR..........six days

4......FOR.........a month

5 .....FOR.....two weeks

6 .........SINCE....last month

7.........FOR........two year

8 ...FOR.........a whole day

9........FOR.............three hours

10......SINCE......Monday

11 ..........SINCE..........my biethday

12 .....SINCE.......last weekend

6 Write for or since

1 ....since.................2002

2 ...............since................yesterday

3 ..............for..................six days

4.................for.................a month

5 .................for................two weeks

6 ...................since.................last month

7.................for......................two year

8 ...................for....................a whole day

9......................for...................three hours

10........................since.............Monday

11 ...................since.....................my biethday

12 .......................since.................last weekend

1. It's ages since I saw her

2. I haven't met George for two weeks

3. They arrived here three months ago

4. We have not met each other for five days

5. Haven't you tasted one before?

6. I haven't smoked a cigarette for ten years

7. It's two weeks since I last drank wine

8. I came to Istanbul in January

9. They have been to Ankara for two years

10. This is the first time she has been to Rome

3750000 đồng.

(5,25 + 72,9 - 47,8) - (12,9 - 3,23 - 46,8)

= 5,25 + 72,9 - 47,8 - 12,9 + 3,23 + 46,8

= (5,25 + 3,23) + ( 72,9 - 12,9) - (47,8 - 46,8)

= 8,48 + 60 - 1 = 68,48 - 1 = 67,48