$1$. My brother has never bought a car before

$2$. I haven't eaten this food before

$3$. How long have you has TV ?

$4$. How long have they seen her ?

`->`before: trước đây

`->`S + has/have + never + Ved/3 + O + before: Ai chưa từng làm gì trước đây

`->`How long + has/have + S + Ved/3 + O ?: Đã làm gì đó bao lâu ?

1. My brother hasn't bought a car before

2. I haven't eaten this food before

3. How long have you had TV ?

4. How long have they seen her?

~~~~~~~~~~~~~~~~~~~~~~

- Cấu trúc 

Câu 1,2:

S+have/has+not+Ved/P2+...

-> It/This is the first time+S+have/has+Ved/P2+...

Câu 3,4:

When+did+S+V(bare inf)+...?

-> How long+has/have+S+Ved/P2+...?

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