`1.` My friend has failed his mathematics exam twice! He failed it last year and this year. (fail)

`2.` Sally has studied English before. When she was a child, she studied it at school. (study)

`3.` Google has made different driverless cars and in 2016 it made a car which travelled 200,000 km with no driver. (make)

`4.` I called you again at eight this morning, but there was no answer. So in total, I have called you five times! (call)

`5.` We saw a film at the weekend. I have seen it a few times before, but it was still funny. (see)

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

`@` Thì htai hoàn thành: S`+`has/have`+`V(ed,c3)`+`O...

`@` Thì qkđ: S`+`V(ed,c2)`+`O...

`giahan27511`

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, ...

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

1. has failed / failed 

DHNB: last year (QKD)

2. has studied / studied 

DHNB: before (HTHT)

When + QKD, QKD

3. has made / made 

DHNB: in 2016 (QKD)

4. called / have called 

DHNB: this morning (QKD)

5. saw / have seen

DHNB: before (HTHT)

`color{orange}{~MiaMB~}`