Đáp án + Giải thích các bước giải:

`17.` Sue has been interested in healthy eating for 3 years.

`18.` She has learnt English for three years.

`19.` It has snowed since 5 o'clock.

`->` Started/ Began + Ving/ to V = S + has/have + PII + ..... + (for + khoảng thời gian/ since + mốc thời gian)

`17.`Sue began to be interested in healthy eating 3 years ago.

`->`Sue has been interested in healthy for 3 years.

`18.`She started learning English three years ago.

`->`She has leant English for three years.

`19.`lt started to snow at 5 o'clock.

`->`lt has started to snowed since 5 o'clock.

Công thức chuyển từ QKĐ `->` HTHT :

QKĐ : S + V -ed/V2 `->` HTHT : S + have/has + V2 + for/since.

for : + time : khoảng tgian ko xác định

since : + time : khoảng tgian xác định

$#linhnguyen.xin ctrlhn$