When did you start to work for this company?
>How long is it since you started working for this company
>How long have you worked for this company
- How long is it since they moved to this city?
When did she learn English?
> How long is it since she started learning english
>How long has she learnt english ?
When did she learn english ?
How long have english been learned by her
xercise 1: Viết lại câu sao cho nghĩa không đổi.
The last time she came back to her hometown was
months ago
She hasn't come back to her hometown for months