6. I haven't spoke to David since Christmas

7. Nam's brother play the guitar better than him

8. I have never drunk cocktail before

9. We all think that painting is interesting because it is a creative activity

10. Sue has started to eat a low carb diet for two years

$1. $ I haven't spoken to David since Chistmas

$→$ The last time + S + Ved+ was + time + ago

$→$ S + have/ has + not + Vpp + for + time

$2. $ Nam's brother plays the guitar better than Nam

$→$ So sánh hơn với tính từ ngắn : S + tobe + adj + er + than + Noun/ Pronoun

$3. $ I have never drunk cocktail before

$→$ This is the first time + S + have/has +P2: Lần đầu làm gì

$→$ S + have/ has + never + P2 + before

$4. $ We all think painting is interesting because it's a creative activity

$→$ S + find + N / V-ing + adj

$→$ S + think + N / V-ing + is + adj

$5. $ Sue has eaten a low carb diet for 2 years

$→$ S + began / started + to V/ V-ing + time ago

$→$ S + have/has + P2 / been Ving + for / since ...

`@Chamian`