`I`.

`1`.My sister is a fast runner

`\rightarrow` Thì HTĐ ( ĐT Tobe ) : S + is / am / are + adj / n

`2`.I have never eaten such a delicious meal before

`\rightarrow` S + have / has + never + V3 / PII + before : Chưa từng làm gì trước đây

`II`.

`1`.We haven't seen her since Christmas Day

`\rightarrow` Thì HTHT ( PĐ ) : S + haven't / hasn't + V3 / PII

`\rightarrow` Đặc điểm nhận dạng : since

`2`.Hugo is interested in playing sports in his free time

`\rightarrow` be interested in + V-ing / N : Hứng thú cái gì

`\text{# Kirigiri}`

Đáp án + Giải thích bước giải:

I.

1. My sister is a fast runner

→ Thì HTĐ: S + tobe + adj/n

2. I have never eaten such a delicious meal before

→ S + have/has + never + V3/ed + before: chưa từng làm gì trước đây..

II.

1. We haven't seen her since Christmas Day

→ thì HTHT: (-) S + have/has (not) + V3/ed + ...

→ dấu hiệu: last time

2. Hugo is interested in playing sports in his free time

→ chỉ người → dùng V-ed