`1.` I haven't watched The Twilight Saga series for 5 years.

`-` The last time + S + V-ed/c2 + ... + was + time ago

`=` S + haven't/hasn't + V-ed/c3 + ... + for time

`2.` How long is it since our teacher tasked us with a market research project ?

`-` When + did + S + V-inf + ... ?

`=` How long is it + since + S + (last) + V-ed/c2 + ... ?

`3.` The last time I met him was 3 days ago.

`-` S + (last) + V-ed/c2 + ... + time ago

`=` The last time + S + V-ed/c2 + ... + was + time ago

`4.` She has worked as a recruiter for 3 months.

`-` S + started + V-ing + ... + time ago

`=` S + have/has + V-ed/c3 + ... + for time

`5.` He has played ice hockey since he was 6 years old.

`-` S + began + V-ing + ... + when + S + V-ed/c2 

`=` S + have/has + V-ed/c3 + ... + since + S + V-ed/c2

Các công thức đổi HTHT - QKĐ

Structure 1: 

S + has/have + not + V3/ed + for/since + time 

--> S + last + V2/ed 

--> The last time + S+ V2/ed + was + time 

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

Structure 2: 

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

--> When + did + S + V1?

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

Structure 3:

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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1. I haven't watched "The Twilight Saga” series for 5 years.

2. How long has our teacher tasked us with a market research project? 

3. The last time I met him was 3 days ago.

4. She has worked as a recruiter for 3 months.

5. He has played ice hockey since he was 6 years old.

`color{orange}{~MiaMB~}`