Các công thức đổi HTHT - QKĐ

Structure 1: 

How long + has/have + S+ V3/ed?

--> When + did + S + V1?

--> How long is it + since + S+ V2/ed ?

Structure 2:

S + has/have + V3/ed + for/since + time 

--> S + started / began + to V / Ving 

--> It is / has been + time + since + S+ V2/ed 

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Bị động - các thì:

- Thì HTĐ: S + am/is/are + V3/ed 

- Thì TLĐ: S + will be + V3/ed 

- Thì QKĐ: S + was/were + V3/ed 

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5. Mr. Nam has worked in this company since 1998.

6. How long have you learnt French?

7. My friend, Bob, has not smoked for 3 years.

8. Passover is celebrated by all Jewish people in late March or early April.

9. Children will be given sugar eggs at Easter.

10. Tuan was nominated as the most effective activist in the town charity program by his friends.

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