Công thức thì HTHT

(+) S + has/have + V3/ed 

(-) S + has/have + not + V3/ed 

(?) Has/Have + S+ V3/ed?

DHNB: before, since + mốc thời gian, for + khoảng thời gian, yet, already, just,....

Công thức thì HTĐ (V: tobe)

(+) S + am/is/are ..

(-) S + am/is/are + not .. 

(?) Am/Is/Are + S + ... ? 

I + am

S số ít, he, she, it + is

S số nhiều, you ,we, they + are

Công thức thì HTTD 

(+) S + am/is/are + Ving 

(-) S + am/is/are + not + Ving 

(?) Am/Is/Are +S +Ving? 

DHNB: now, right now, (!), at present, at the moment,.....

-----------------------------------------------------------

51. B

52. C 

DHNB: recently (HTHT)

53. A 

It / This is the+ số thứ tự + time + S + has/have + V3/ed 

54. B

DHNB: yet (HTHT)

55. B

Wh + has/have  + S+ been + Ving? thì HTHTTD

56. A

DHNB: just (HTHT)

57. D

58. B

One of + N số nhiều + V(ít)

59. D 

DHNB: at 7 o'clock yesterday evening (QKTD)

`color{orange}{~MiaMB~}`

`\color{#145277}{N}\color{#246483}{a}\color{#34768F} {e}\color{#44889B}{u}\color{#539AA7}{n}`

`***` Thì HTHT : 

`@` For `+` quãng thời gian : trong khoảng (for a month, for a long time)

`@` Since `+` mốc thời gian : từ khi (since `2006`, since `2008`)

`(+):` S + have/ has + VpII

`(-):` S + have/ has + not + VpII

`(?):` Have/ Has + S + V3 `?`

       WH-word + have/ has + S (not) + V3 `?`

`->` S = I/ We/ You/ They + have

`->` S = He/ She/ It + has 

`***` Thì HTHT tiếp diễn :

`(+):` S + have/ has + been + V_ing

`(-):` S + have/ has + been + not + V_ing

`(?):` Have/ Has + S + been + V_ing `?`

       WH-word + have/ has + S + been + V_ing`?`

`--------------`

`51. B`

`52. C`

`53. A`

`54. B`

`55. B`

`56. A`

`57. D`

`58. B`

`59. D`