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1. Before Mr. Nam came here, he met his closest friend.

- After/Before + Ving, clause

= Before/After + clause, clause

2. This is the most beautiful girl we have ever seen.

- S + have/has + never + Ved/Vpp + such + (a/an) + adj + N + before

= This is the adj-est/most adj + N + S + have/has + ever + Ved/Vpp

3. Nam has played golf since he was 12 years old.

- S + started + Ving/to V + thời gian + ago

= S + have/has + Vpp + for + khoảng thời gian

4. I have never seen a more interesting film than this.

- This is the adj-est/most adj + N + S + have/has + ever + Ved/Vpp

= S + have/has + never + Ved/Vpp + such + (a/an) + adj + N + before

5. How long have you played the piano?

- When + did + S + begin/start + to V/Ving +...?

= How long + have/has + S + Vpp +...?

6. I haven't visited Hoi An for 6 years.

- The last time + S + Ved / V2 + was + time + ago

= S + have/has + not + Vpp + for + khoảng thời gian