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 QKĐ (V: thường)

(+) S + V2/ed 

(-) S + didn't + V1 

(?) Did + S+ V1?

DHNB: ago, last (year, month ...), yesterday, in + năm QK, ...

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

70. B

DHNB: in 2002 (QKD)

71. D 

DHNB: for the past five years (HTHT)

72. D 

DHNB: up to now (HTHT)

73. A

HTHT + since + QKD

S + last  +V2/ed

74. A 

The number of + N số nhiều + V (chia số ít)

DHNB: recently (HTHT)

75. C 

HTHTTD + since  + QKĐ

HTHTTD: S + has/have + been + Ving 

76. A

DHNB: up to now (HTHT)

77. A

DHNB: all day (HTHTTD)

78. C 

DHNB: all day (HTHT)

`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`?`

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

`70. C`

`71. D`

`72. D`

`73. A`

`-` It has been + time + since + S + last + V2/ed + O

`74. A`

`-` The number of + Noun (số nhiều) + V (chia theo chủ ngữ số ít).

`75. C`

`76. B`

`77. A`

`78. C`